Prime Fitness
gymsolympic weightlifting

Prime Fitness

star4.8/5
(184 reviews)Excellent

About

Prime Fitness offers a focused training environment with disciplines including gyms and Olympic weightlifting. The facility provides 24/7 access, free weights, machines, cardio equipment, and free parking. Owner and professional trainer Keith Diedrich, a certified personal trainer since 2005 with a business management background, brings both expertise and a personal touch to the operation.

reviewsWhat Members Say

Members consistently praise the gym's exceptional cleanliness and well-maintained equipment, regardless of the time of day. They highlight the welcoming, respectful atmosphere where people focus on their workouts without ego, creating a stark contrast to conventional chain gyms. Owner Keith Diedrich receives specific praise for being approachable, knowledgeable, and genuinely invested in both the facility and its members. Reviewers particularly value the 24/7 access for unpredictable schedules, the convenient Hillcrest location with ample parking, and the availability of a sauna for affordable per-use fees.

rate_reviewGoogle Reviews (5)

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Gustavo L

a month ago

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I think I made the best decision choosing Prime. Keith has set up a clean and safe space. The convenience of being a 24hr gym in Hillcrest short ways from The 5 freeway makes it a no brainer for me. Everyone has been super friendly and encouraging, I hope you check it out too.

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Emma Cheban

2 months ago

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Love this private gym. It’s always super clean, never overcrowded, and has everything you need. Keith, the owner, is awesome, knowledgeable, friendly, and genuinely cares about the space and the people who train here. Great environment and highly recommend if you’re looking for a well-run, private gym.

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Jimmy Beegz

3 weeks ago

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Open 24hrs and rarely if ever too busy to get on a machine you want. The owner is cool and knows the members by name and you can tell he is very passionate about what he does. I also love how close it is to where I live. Very convenient place to work out if you’re in the hillcrest or banker’s hill area. I would much rather pay a little extra for what I get at this gym compared to a lower monthly fee at a place like eos or 24hr where everyone is there for ego and to be seen.

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Tim Rupe

3 months ago

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Prime Fitness is hands-down one of the best gyms I’ve ever belonged to. The first thing that stands out is the cleanliness—it is consistently immaculate, no matter the time of day or night. That alone says a lot about how much care goes into running this place. The 24/7 access is a huge benefit for me. I don’t have a predictable schedule, and being able to work out whenever it fits my life makes a real difference. Whether it’s early morning or late at night, the gym is always accessible and well maintained. What really sets Prime Fitness apart, though, is the atmosphere. The other members are genuinely friendly and respectful. This is not a show-off gym at all—everyone is focused on their own workout, and no one makes anyone else feel uncomfortable. It feels neighborly in the best sense of the word. Lastly, the owner, Keith, deserves special mention. He is one of the nicest people I’ve ever met—approachable, kind, and clearly invested in creating a positive experience for everyone. Prime Fitness is a true gem in Hillcrest, and I can’t recommend it highly enough.

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Kenny Hoang

2 months ago

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So glad to be within walking distance of this gym. Everyone is respectful and mindful of others, and it’s a stark difference from the conventional chain gyms. The owner is welcoming and clearly invested in creating a positive environment. The facility is always clean and well maintained (thanks to the owner and members wiping equipment after use), and has everything you need for a solid workout. Also love that there’s a sauna available for an affordable price per use. It’s a great local gym open 24/7. There’s plenty of street parking and parking behind the gym, so also accommodating for those coming from afar.

fitness_centerAmenities

24/7 AccessFree WeightsMachinesCardioFree Parking Lot

Contact

location_on

3935 First Ave., San Diego, CA 92103, USA

scheduleHours

Monday: Open 24 hours

Tuesday: Open 24 hours

Wednesday: Open 24 hours

Thursday: Open 24 hours

Friday: Open 24 hours

Saturday: Open 24 hours

Sunday: Open 24 hours

groupCoaches & Instructors

person

Keith Diedrich

Owner and Professional Trainer

Certified Personal Trainer since 2005, B.A. in Business Management

Born in Chicago, moved to San Diego in 2011. Professional trainer since 2005. Focuses on guiding clients to reach fitness goals safely with timely results. Provides nutritional guidance.