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Jake Kleis

47 Third St, Cambridge, MA 02141, USA

(30)
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About

Let’s make getting in shape way less confusing.

Hey — I’m Jake, and I help everyday people build muscle, get stronger, and become more flexible…

So you can:
✔️ Feel confident in your body
✔️ Eliminate nagging tightness and joint pain
✔️ Actually enjoy working out (even if you’ve hated it in the past)

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13 hires on Bark
1 hour response time

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Videos (9)

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Reviews (30)

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5/5

30 customer reviews

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26 April 2025

I’ve been taking classes with Jake since June 2024. He was very fast in responding for our first session, and scheduling was and continues to be a breeze!

I didn’t have any fitness goals in mind when I started, but have gained a considerable increase in strength, making daily life easier in every aspect.

I highly recommend Jake for personal training— he combines expert advice with empathetic guidance and creates a superb atmosphere for every session!
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26 April 2025

Jake is fantastic. His training style is not only highly effective, but he also genuinely cares about improving all aspects of your lifestyle. I started from a completely sedentary background, and with Jake's help, I’ve made real, lasting changes: structuring my meals better, increasing my daily activity, prioritizing my sleep, and steadily building a healthier routine overall.
He's also incredibly adaptable. On days when I wasn’t feeling my best, Jake always adjusted the sessions to meet me where I was, helping me stay consistent and make the most out of each situation, taking whatever small wins we could. His encouragement has been key to keeping me on track. And on good days, we’ve been able to push harder and make rapid progress. It has been genuinely motivating and rewarding to work with him.
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25 April 2025

Personal Trainers

Ive been with Jake for almost a year.
I’m feeling better physically, I’ve made noticeable progress, and he’s been imperative in helping with recovering from meniscus surgery.
He’s flexible with my schedule.
Looking forward to our next session… kinda 😅👍🏻.
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verified
25 April 2025

Personal Trainers

I had no experience lifting weights and wanted to find a trainer who would provide education and be supportive of my goal of becoming stronger. Jake has helped me immensely and I tell everyone now about my training sessions and how I’m getting stronger each week. Jake answers all my questions and motivated me to join a gym to work out on my own. I highly recommend training with him. More...

7 October 2024

Jake has been my personal trainer for more than a year. Because of my cardiac issues and other health reasons, I wanted to become healthier through building muscle and improving cardiovascular health. I sought out a trainer because I was intimidated by gyms and the myriad equipment as well as the different exercises; I was not sure how best to start and be effective. Jake made that all easy and worked around my limitations (e.g. joint pain) during our sessions and came up with appropriate alternative exercises. He has also been responsive outside of sessions, offering advice and encouragement. Highly recommend! More...

17 September 2024

Working with Jake has been transformative for me. I’ve tried physical therapy and worked with other trainers in the past, but they just didn’t seem to get it. My back pain from a car accident was still there, and I wasn’t sure what else to try. Then I started working with Jake, and things finally started to change.

Jake took the time to really understand what I was dealing with. It wasn’t about pushing through the pain or following some generic plan. We focused on improving my mobility and building up my core in a way that made sense for me. It wasn’t about chasing numbers or hitting some arbitrary goals—it was about getting me back to a place where I could move comfortably.

Now, my back pain is way more manageable, and I feel like I’ve got my mobility back. It’s not like a magic fix, but it’s made a big difference in my day-to-day life. I can focus on work without that constant ache, and I’m back to doing things I enjoy.

If you’re like I was and haven’t found something that works yet, I’d definitely recommend giving Jake a shot. He really knows his stuff and takes the time to figure out what works for you.
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17 September 2024

Personal Trainers

I’ve been working with Jake since February 2024 till present. Even before that, I had been following him on socials for about a year prior. Before I started with him I had goals that I struggled to hold my self accountable for. These goals were achievable but I wasn’t able to do it for myself until I met Jake.

I’m 28 and work as a delivery driver. My job is pretty physical. I’m on my feet for several hours five days a week, so lifting and mobility is crucial. Before working with Jake I will say that I struggled to complete my every day work week. I weighed 257 lbs. and was considered morbidly obese.

I suffered a major knee injury and tore my acl. After my injury I knew that I had to make my health a priority. My doctors recommended I consider weight loss medications with a consistent training schedule, so I started Wegovy injections once a week and got started at the gym.

I’ve been working with Jake for 8 months and has helped me lose over 60lbs! I feel the best that I have in my life and I couldn’t thank Jake enough for helping me reach personal records each time that I see him.

Jake has helped coach me through my struggles and continues to work with me and looks out for my best interest.

I now weigh 195 lbs! I look and feel great. I have been more confident and more comfortable in my own skin. Jake has made a huge impact on the way I look at life and how I prioritize my own health. I’ve learned a lot from him and his program. Reaching out to him was the best decision I have made for myself.
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verified
16 September 2024

Personal Trainers

I'm a 33-year-old desk worker, mostly sedentary with the exception of a few attempts at exercise programs over the past decade. And I've tried everything out there; crossfit, couch-to-5ks, online and app lifting programs, paid for fancy gyms. Nothing's lasted more than a couple months - burnout, confusion/analysis paralysis, and general lack of confidence were recurring themes.

I started training with Jake ~4 months ago and things have taken a turn...
- I've lost weight and gained muscle mass
- Posture has improved and back pain is totally gone
- I am SO much stronger (in my first session I literally laid on the ground after struggling to deadlift a 45 lb bar. Last week I deadlifted 315. Many other lifts have doubled)

Maybe most important, I've got momentum. I've always dreaded exercise, but now I'm hungry for it.. I want to crush a training session, break PRs, squeeze in extra training days, etc. Jake lit a fire under my ass! I still have a lot of work to do, but am fired up and (maybe for the first time) know with 100% confidence that I'll do it.

If you're struggling to stick with a program or need someone who can provide and motivate real sustainable progress, I highly recommend Jake!
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27 December 2023

Jake is phenomenal at what he does. I did weekly personal training sessions with him at Dirty Water Fitness. With his expert guidance, I not only built strength but also gained an understanding of proper technique and the science behind it all. His positive yet straightforward feedback was very motivating, and his personalized workout regimens were tailored to my goals, making every session a rewarding and educational experience. I can't recommend Jake enough for anyone seeking a dedicated, knowledgeable, and motivational trainer. More...

19 August 2023

I have been training with Jake for several weeks. He is professional, punctual, and certainly a subject matter expert. He tailored the workouts to my personal goals, which he helped me achieve. I am lot stronger and more purposeful with my workouts since I started training with him. It is a great return on investment. I highly recommend him! More...

21 July 2023

I’ve been training with Jake for several months now and I’m very happy with my progress. He creates programs that are tailored to his client’s needs and I am feeling stronger and healthier each week. Outside of lifting, he is also very knowledgeable about stretching and nutrition and I love all the tips he’s shared with me. Highly recommend Jake if you’re looking for a trainer who’s personable and enjoyable to work with but also challenges you to continuously improve and reach your goals. More...

26 June 2023

Jake is the first personal trainer I’ve had where everything is really clicking. He pushes me and holds me accountable and makes sure I’m always getting the most out of my performance. If I think I can only do a certain amount of weight or a certain amount of reps, he always makes sure I’m truly making out on my capability and effort. I’ve never felt better or gotten more results in such a short period of time. More...

11 April 2023

I’ve been working with Jake for a few months now. He stretches me immediately after my strength training. I am 60y/o and have never been stretched professionally before. I have made incredible gains with my flexibility and strength. Jake is super knowledgeable and extremely easy to work with. I would definitely recommend adding a stretching routine with Jake to your self care journey. I’m so glad I did. Mary More...

30 March 2023

I started doing training with Jacob in January of this year (2023) because I needed to make a change, get fit and become more disciplined. He crafted a customized workout plan for my lifestyle with realistic goals. The workouts are thorough and well-rounded. I always leave the gym feeling sore and wake up sore the next day (in the best way). He’s boosted my confidence and competence in the gym. Cannot recommend Jacob enough!! More...

23 March 2023

I've been training with Jake for 4 months and have made great progress. He crafts workouts to meet your level and goals. I wanted to get in shape for ski season and the workouts no doubt improved my skiing fitness and confidence in the advanced terrain . His knowledge and passion for fitness and the PR's I consistently hit keep me coming back for more!
-Chris, 37y/o physician
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9 March 2023

I stretched w/ Jake weekly for about a month and a half as well as doing stretches he gave me to do on my own and had fantastic results! I felt a huge difference in my flexibility and mobility, and it helped w/ relief of persistent pain in my hip and shoulder. Jake was also very thoughtful and knowledgeable about figuring out what type of stretching I needed to do my my specific issues. Highly recommend! More...

verified
9 July 2022

Personal Trainers

As a former marathon runner and triathlete, endurance sport is still part of my daily life with some ups and downs due a demanding job. Currently, I’m as well focusing on fun activities like surfing, mountain biking and hiking.

I originally went to Jake to keep my strength level in between surf vacations. However, I could gain so many more successes through the regular sessions.
I was surprised to shave of one minute per kilometer on my slow runs and even a bit more on my faster runs.
After mountain bike tours I do not have sore muscles anymore.
In surf vacations, I jump right on the board and have a better endurance than before I went to Jake, skipping the cycle of building up strength on the expense of valuable time in the water.

Even though I know exactly the importance of strength training for my beloved sport activities and daily life, I just cannot stand doing it.
Jake has a calm, stable personality and is extremely knowledgable. He brings in the patience, that I’m lacking of, whenever trying to do these trainings on my own.
He did an extraordinary job, making my hated strength training feel easy and fun, and he also did not mind working his sessions into my busy and hectic schedule. I highly recommend him.
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verified
28 February 2022

Personal Trainers

Very knowledgeable and and friendly! A great trainer for anyone. Would highly recommend.

4 January 2022

Jake does a good job in providing challenging workouts in the gym. He has been training me for the past 5 months and I have seen good progress in my overall health and stamina. I also enjoy how he switches the workouts up. More...

23 December 2021

I have been working with Jake 2x per week since May 2020. He keeps me on a workout plan that is focused on the objectives that I set with him, but he adds new exercises or variations to keep me challenged and keep the workout interesting. I’ve made steady progress so far thanks to his holding me to task and challenging me to keep beating my personal best results.
I look forward to making continued progress working with Jake man’s know that it will be much faster than it would ever be if I were working out on my own.
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3 December 2021

Jake has really gotten me on track with weightlifting by helping me create and stick to a schedule. I wasn't normally very much into exercising and at best was very intermittent, but decided to make a serious attempt at sticking to a plan. Just from our initial meeting, Jake was very knowledgeable and made sure to create a fitness program that suited me after talking with him about my fitness goals, and made adjustments throughout the program as those goals changed. Thanks to him I'm seeing massive progress and it has given me the motivation to continue working out even outside the training sessions. 10/10 would definitely recommend! More...

2 December 2021

Jake is always available to answer all the question that I have regarding the workout, fixes my movements and he really motivates me to achieve my physical goals. His plans are customized to your goal, flexible to your routine and covering core muscles of your body.

He is the personal trainer that will help to have perfect body fit.
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verified
29 November 2021

Personal Trainers

I couldn’t possibly be happier for hiring Jake. I desperately needed a reset, hadn’t worked out in a long time, and Jake has been absolutely amazing. He listens super well to all my goals, constantly asking good questions, keeping every workout really engaging and fresh, and is a genuine student of fitness. He’s on point with all his instruction and cares deeply about the subject to make sure I’m getting excellent guidance, and motivates me to get the best results possible. Working with Jake has been a game changer in my life - thanks so much man. I recommend Jake to the Highest degree to anyone trying to get their whole body back in shape More...

9 September 2021

Right off the bat I could tell Jake is passionate about knowing his stuff when it comes to strength training and overall body health, and he puts in the work to know his stuff. As someone who’s problem has always been form and balance (although I’m stubborn about it), Jake has been able to correct many of my flaws in just the first few sessions. Working out with Jake makes your body feel tired but very health and rejuvenated after, and I am looking forward to continuing my training with him! More...

verified
9 September 2021

Personal Trainers

Jake made the difference for me to achieve my fitness goals. I came in Day 1 without a lot of experience in the weight room and with a joint injury that had been bugging me for a few years. He helped me build confidence in weight training and put together a 6 week program. The 6 weeks flew by and I saw a massive difference in my fitness and my joint issues disappeared. I'm now working on a second 6 week program and loving every session.

10/10 would recommend Jake for anyone who is serious about trying to achieve their fitness goals or wants to build confidence around the weight room. Also, his music selection is 🔥🔥🔥
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8 April 2021

Jake is a really interesting guy and super knowledgeable in his training. He really does put his clients best interest first. 10/10 would reccomend!

8 April 2021

Working with Jake has its perks ill say that I do recommend seeing him for a work out

8 April 2021

Jake is awesome! He always explains things in a way that is very understandable. I feel MUCH stronger and healthier than I was before working with him. 10/10 would recommend

8 April 2021

Great service and a very client friendly trainer! Always available to answer my questions. Guy really know his stuff! Would HIGHLY recommend!

8 April 2021

Jake is a great trainer! Has a great personality and creates a hard working environment to achieve your fitness goals, no matter the client. Highly recommend!

Q&As

By giving them a good balance of what they want and what they need. They can have dessert (4x20 bicep curls), but they need to eat their vegetables first (5x5 squats).

Lifting weights, stretching, and eating a reasonable diet.

I love speeding up the process of getting fit for my clients. It took me years of trial and error, without much guidance, to get to where I am. Now, I'm able to take the 10+ years of lifting experience I have and curate the best information to give to my clients right now.

I've worked terrible jobs all my life and I decided I needed to make a change.

Because you know you need to make a change and I can help you get there.

Yes, I offer custom 8-week programs delivered via Google Sheets as well as monthly online programming, which includes a new program every month, check-ins, text support, and program adjustments.

We wipe down the equipment after every use and have biweekly deep-cleans in the gym.

Services

Custom online programming through the app Trainerize. Access to the app includes full programming (with a new phase every month), video tutorials of exercises, and in in-app messaging platform directly to me to answer any questions you may have!

One time purchase for a 6 Week program tailored specifically to your goals. Just let me know:
1. Your goals
2. What equipment you have access to
3. How many days per week you'd like to train
4. Any injuries you may have
And I will construct a custom workout plan that will deliver you results

1-on-1 parter assisted stretching is a fantastic service for anyone, from the average person to an elite athlete, to recover from their workout, relax, and provide routine maintenance to their body.

How does it work?
We start by discussing your injury history and any areas of tightness or restriction that you experience. Then, we go through a series of partner assisted stretches on a massage table with the goal of providing relaxation and increased range of motion to your muscles.

Send me a message and we can set you up with an introductory stretch for just $59!