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Fitness Underground

4.8

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Location details

1410 E Foothill Blvd Suite JK, Upland, CA, 91786, United States

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4.864 reviews
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Adrian Garza's profile image
Adrian Garza 
4 weeks ago

I visited this gym in February of this year while visiting from overseas for the military. I was able to get a week pass for pretty cheap and the owner was pretty nice about everything. He just explained some rules which were basic gym etiquette that I had no problem with. He gave me a key which allowed 24hr access and I was free to use the gym whenever. The equipment is very well taken care of and I had no problem doing my normal workout. This is the gym to go to if you want a clean professional gym that's not too crowded. 

Koach Power's profile image
Koach Power 
a month ago

This is a great gym! All the equipment you need and helpful members and coaches willing to direct you. This place is responsible for some of my favorite adult memories! 

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Scott 
7 months ago

One of the best gyms I’ve been to great. 24/7 access, more than enough equipment and great people. Definitely recommend it 

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Rick Gonzalez 
7 months ago

Fitness Underground is as close to perfect as it gets. It’s open 24/7, always clean, and never overcrowded. The atmosphere is great. Everyone is friendly and follows proper gym etiquette. Their social media is a goldmine of useful fitness tips, and the music is always on point since members take turns curating the playlists. Easily one of the best gyms around. 

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Jonathan Jabbour 
7 months ago

just started coming here with my buddy recently and i don’t regret it. they have the best lifting equipment and machines i’ve seen out of any other gym i’ve been too in a 30 minutes drive. The owner Ian is awesome, he’s super cool and chill. the gym is super clean and the community is amazing. you can come in at 6pm and see it for yourself. you’ll see people cheering for a random dude hitting his PR. It’s a really cool environment. 

Frequently asked questions about Fitness Underground

How is Fitness Underground rated?

Fitness Underground has a 4.8 star rating with 64 reviews. 

When is Fitness Underground open?

Fitness Underground is open now. It is open 24/7. 

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