j+k fitness studio - San Francisco, California

Daphne Adam

I've been working with Griffin for 18 months now, and it's been absolutely life changing. I started after my second pregnancy because I was feeling like I couldn't keep up with my two young kiddos. Now I can handle them easily, and am hitting strength milestones I've never achieved before in my life. Griffin is patient and keeps the workouts interesting. He is skilled at modifications to prevent injury. If Griffin is out of town, J+K has other great trainers who can step in to keep you consistent. Jae and Christina have been wonderful to work with as well. The gym is well equipped and clean and everyone there (trainers and clients) is friendly and welcoming. Highly recommend!

Michelle Cox

Training with Benny over the past two years has been a true delight. My husband and I go together, with a focus on strength, flexibility, and balance. It's challenging, rewarding - and fun! Benny crafts workouts that address the things we need to work on and keeps it interesting. Jae and team make the gym a welcoming environment, and I always walk out glad I went.

Marc Henrich

Excellent gym with an amazing team of trainers. I work mostly with Benny, who is awesome, but have also worked with Griffin and Adriana and all of them are top-notch. Knowledgeable, patient, and always positive. Workouts are tailored to your needs and trainers are very attentive to injuries. The whole place has a great vibe. Highly recommend!

Jeff Fassnacht

I’ve been working with Jae and Benny - and sometimes Griffin - for four months. From the first session, it was clear that Jae and his team bring a wealth of knowledge about physical training. He conducted an assessment of my fitness level and mobility. We also discussed my goals, a current limitation, and the fact that I play tennis regularly. With that information, his team focused on building my core strength, agility, and flexibility - all of which have noticeably improved my movement, my tennis game, and provided a boost in my overall fitness and energy levels in daily life.

Their personalized approach ensure that we worked towards my goals and within my limitations. The team’s encouragement and energy are contagious. They strike the perfect balance between pushing me to exceed my limits and understanding when I need to pull back. They’ve also helped me with recovery strategies, including stretching routines and injury prevention tips, which have been a game-changer for someone at in their 50s.

Aaron Lehmann

Training with Adriana over the last 8 months has been a fantastic experience. She worked with me to create a very personalized program that delivered impressively noticeable results already. When I had an unrelated minor sports injury, she was deeply attentive to avoiding exercises that might be problematic, which made me feel very comfortable. She also gave me detailed notes on exercises to do in between training sessions, helping me establish a regular routine. The studio is also a great space with plenty of room to train without getting in anyone's way. Highly recommended.

Drew Fosgard

Jae is hands down the best trainer in all of the Bay Area. He is extremely knowledgeable about the fitness journey and customizes a program specific to your need. In person he pushes you to your limit and maximizes the time you spend with him. An added bonus, he's very personable and fosters trust with his clients. Cannot recommend Jae enough for those looking to kickstart their fitness journey!

Maryann Ibrahim

The trainers at J&K are stellar! I’ve worked with a few different trainers and each one brings something unique to the table.Adriana and Christina, in particular, are great at listening to your needs and tailoring workouts, especially when it comes to building muscle as a woman. The gym vibe is always positive. If you want to get in shape in a great environment, come here!

Alli McDonough

I’ve been training with Jae, Christina, and Adriana for 9 months now, and I’m so, so happy with the results! I go three times a week, with Jae & Adriana focusing more on my cardio and Christina focusing on strength-building. I’ve made huge gains in my endurance and strength, and they’ve done a great job at adjusting workouts to help with past injuries or focus on developing certain areas. All three of them are great at pushing me while not letting me get away with poor form, and they’re always super supportive when I need to sit on the floor and wheeze for a bit.

Plenty of other reviews have already covered their extensive knowledge of anatomy and exercises, so I won’t go into that, but I can confirm that they’re always happy to answer my questions about the benefits of a particular movement.

Scheduling-wise, I was upfront about the fact that I wanted to essentially outsource my willpower - I wanted trainers who would be proactive about scheduling sessions and force me to opt-out if I couldn’t make them, rather than someone who would just wait for me to opt in to sessions. They’ve accommodated that request beautifully, and the fact that they work as a team means that I rarely have to miss out on sessions because someone’s out of town.

Can’t recommend them highly enough!