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Cassie Hecker | Owner & Founder

After 10 years in the industry, I created and opened Sweat to fill the void I saw in the industry: A group workout fit for the silent type A busy parent/professional. The Sweat programming is purely focused on building a highly functioning body. The workouts are strength focused with effective cardio work.  As a high performer outside of the gym, each class you can squeeze into your week must be the most effective, most efficient, and above all else the safest.

After spending years in all sorts of different types of gyms watching women skip the weights, seeing bad form with crazy lifts, and weekend warriors always getting injured, I created our format to make strength training "fun", well balanced, and very effective at making all bodies stronger without injuring joints. There is a method to the madness: varying how we overload the muscle group of the day, how we push the heart rate, and how your balance/stability is challenged results in you being a high functioning human.

The workout of the day is consistent, any trainer, any time, any location. It is set up that you can come multiple days in a row, hop around, or jump right in for your first workout, you won't over-train or feel behind. Our system of time-based intervals allows for each member to work at their own pace (and be ready for that bell to ring!)

Workout with Cassie >

Book a Private Session  with Cassie >

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Andrew is a Bay Area native from the Concord area.  He grew up playing rugby and wrestling and from these sports developed a passion for weightlifting and all things fitness. 

His most recent addiction has been indoor rowing and he can’t wait to get on Lake Merrit to try rowing with a crew.  He has worked in many fitness studios, both locally owned studios and bigger national studios, and is loving the intense and fast-paced Sweat workout.  Outside of fitness, his other passion is music and he loves going to music shows and dancing the night away.  You can expect an energizing loud class from Andrew that is sure to get your heart pumping.

Workout with Andrew >

Book a Private Session  with Andrew >

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Justin has been a HIIT group fitness instructor with Sweat since 2017. Originally from Melbourne, Australia he grew up playing sports and continued competing through college (B.Ed. + BS). When he's not at Sweat, he's playing Australian Rules Football or swimming some laps to recover. 

Workout with Justin >

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Originally from Connecticut, Ashley is passionate about preventative health and encouraging others to feel good through exercise and nutrition. Ashley loves the Bay - where she can run, bike, roller skate and try lots of new plant based recipes.

Workout with Ashley >

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Rachelle is a NASM certified personal trainer and certified group fitness instructor (Les Mills BODYPUMP and BODYATTACK). An editor by trade, Rachelle previously worked as the editor of 24Life, the digital lifestyle magazine and blog for 24 Hour Fitness, where she interviewed some of the top names in health and fitness, wrote and produced workouts, and more. She was also responsible for creating, directing, and overseeing much of the fitness content for the company's fitness app, 24GO, as well as the company's digital and print marketing campaigns. She is an East Bay native, and currently works as a cookbook editor, where she channels her second passion for food and cooking!

Workout with Rachelle>



Sara-Jean is an actor, speech therapist, and fitness enthusiast from New York. Her passion for fitness and overall health began with running and has now evolved to include weight lifting and HIIT. She believes that the key to life is all about balance and a positive mindset. Oh, AND a really good playlist.

Workout with SJ >

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Sharla is a bad-ass mom of three, public relations professional, outdoor fitness lover, who grew up right here in the East Bay. Her love of exercise and commitment to personal health and wellness began with running and has expanded to lifting, HIIT, and her favorite, beloved Sweat workouts. She is a believer in living life to its fullest with passion and intensity. Catch her coaching an energy-intensive, yet fun workout that will leave you feeling great about your life choices!

Workout with Sharla >



Jenacyn has been a lifelong athlete and a fitness enthusiast participating in sports such as track and field, soccer, yoga, snowboarding, and martial arts; including competing in the Olympic Trials for tae kwon do. After 16 years in corporate marketing, she changed careers, became a NASM certified personal trainer, and turned her passion into her profession. Her goal is to help clients build good habits, both nutritional and physical, to create sustainable lifestyle changes. Working with her means that you will stay ready for what life has to offer.


Workout with Jenacyn  >  

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Jason was born and raised in Sacramento. He has a career in fashion but fitness has always been a huge passion of his. As a NASM CPT, he inherited his athleticism from his parents who he grew up watching play co-ed sports. Jason gets joy from helping others achieve (and is a stickler for form!).

Workout with Jason >



Born and raised in the SF Bay Area, Donovan quickly fell in love with the energy and fun of HIIT classes. Now, as a coach, he channels that passion to ensure all his clients experience the same energy and fun in his workouts!

Workout with Donovan >



Born and raised in Oakland, I've stayed active since my youth swimming in the OPR (oakland parks and recs) summer league, swimming and water polo at Berkeley high school. I went to college in Cal Poly SLO where my athletics took a pause, then got into half marathons and triathlons in my early 20's.

Workout with Ariel >

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Intending to become a physician, and passionate for preventive health, Lexie has a strong belief that exercising not only builds muscle strength but helps improve our mood and memory. She enjoys helping people reach their health goals while approaching every fitness level with encouragement and care. Originally from Houston, Texas, Lexie loves scary movies, algebra, and developing the perfect workout playlist!

Lexie's Zoom Classes >

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Watson (Now available for private session) 


Born and raised in Berkeley, California Watson grew up playing a variety of sports competitively and recreationally. He played soccer at UCSB and has been able to continue playing semi-professionally in Southern California, the Bay Area, and in Greece. As a NASM Certified Performance Enhancement Specialist/Personal Trainer and EXOS Performance Specialist his goal is to help guide people to higher levels of physical fitness/education to encourage the creation of new sustainable habits that lead to success and make exercise/fitness fun.

Workout with Watson>



Want to Join Our Team?


At Sweat we have a very simple philosophy: every body can train to be stronger and function better.

Exercising is a positive experience, and should be fun (for the clients and the trainer!) Our purpose is to adapt every workout to each client's needs: proper form, stability challenges, lifting to failure (medium density training), HIIT Cardio, and of course a healthy dose of Sweat!

We are always looking for killer teammates, for outdoor, indoor, and virtual classes, as well as private sessions!  (and we rent out the space for you to train your own people).

Email Cassie your resume to get the ball rolling!


Born and raised in the SF Bay Area, Devan has been a group fitness trainer for the past seven years, teaching a range of classes from kickboxing to indoor cycling to HIIT & weight training. Her primary goal is a creating encouraging and motivational environments in which every client can channel their inner focus and drive to take their fitness training to the next level.


Outside of fitness, Devan is a multi-disciplinary designer and serial entrepreneur. She runs an eponymous small-batch womenswear label and a digital design consulting agency focused in the diversity & inclusion, sustainability and small business industries. In her off time, you can expect to see her sketching at a café, running around Lake Merritt or hiking with her family dog.

Workout with Devan >