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Fitness Underground

4.8

About this business

24 Hour Access Memberships, Personal Training and Physical Therapy! To become a member, fill out the "contact" form on our website to set up an appointment! 

Location details

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

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4.862 reviews
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Scott's profile image
Scott 
on Google
2 weeks ago

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

Rick Gonzalez's profile image
Rick Gonzalez 
on Google
2 weeks 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. 

Jonathan Jabbour's profile image
Jonathan Jabbour 
on Google
2 weeks 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. 

Riley King's profile image
Riley King 
on Google
2 weeks ago

This gyms great. They have great equipment, everyone is very friendly, and the gym is extremely clean. 

Aram Cariaga's profile image
Aram Cariaga 
on Google
2 weeks ago

I was in the area for a work event and wanted access to powerlifting equipment for a few days. This gym has a lot of powerlifting and machine space, the bathrooms and changing areas are clean, and the community and vibes are among the best I've experienced at powerlifting gyms. Ian was a great help setting me up with the week pass and key fob, and made the whole process to getting all that super straightforward. Would definitely come back for meets or if I'm ever in the area for a few days again. 

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Frequently asked questions about Fitness Underground

How is Fitness Underground rated?

Fitness Underground has a 4.8 star rating with 62 reviews. 

When is Fitness Underground open?

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

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