A member trained here on different days and at different hours for two months, wrote up seven numbered problems, and then left for a gym a 30-minute walk away rather than the 10-minute one. That's the most thorough review on this page and it's worth reading before anything else.
Oxygen is at Kazimierza Gierdziejewskiego 7 in Ursus, Warsaw. It shows 4.3 from 345 reviews, which is a big sample, so the score means roughly what it says. The newest written review is March 2025.
The Seven-Point Review
A member in January 2025, one star: "The condition of the gym equipment is sad, everything is pretty worn out and no one is doing anything about it. The dumbbells with the most popular weights literally have no living space on them, with rags hanging off them. No one sterilizes or treats exercise equipment properly, if you wipe some of them down you can just scrub the black dirt off them. Poorly maintained toilets and showers, often no toilet paper, paper towels, soap, no stalls in the shower. If you come in the evening, the number of people is just STUNNING. There can be a queue of 5-15 people for each machine, there is a very strong noise, even noise-canceling headphones do not help."
He keeps going: no wifi, equipment scattered across three halls with no obvious logic, no multisport card, and a price he doesn't consider competitive.
Then the part that makes the whole thing credible: "I can say that this is not my subjective feeling because I have been visiting this gym for two months in different days and daytime."
He controlled for time of day. Most complaints are one bad Tuesday at six. He went repeatedly, at different hours, and only then wrote.
And the ending: "The only thing this gym still survives on is its location, because for many people it is the closest one. I'll have to walk 30 minutes one way instead of 10, but I'm willing to do that just to leave this place."
That's not an opinion, it's a decision with a cost. He's paying 40 extra minutes a day to be somewhere else. People don't do that lightly, and a location-based monopoly is exactly the kind of thing a 4.3 can hide.
Do I Believe Him?
His checkable claims are specific: queues of 5 to 15 per machine in the evening, no shower stalls, dumbbells in the popular weights worn through, no wifi, three halls. Any of those you can verify in one visit.
What I'd hold at arm's length is the sweep of it. He's the only voice on this record describing any of this, and 345 people landed on 4.3, which isn't what a gym that unpleasant usually scores. Both things can be true: a crowded, tired gym that most people tolerate because it's close, and one member who stopped tolerating it.
Nobody else here contradicts him either. They just talk about different things.
What Everyone Else Is Reviewing
A member in March 2024: "I can truly recommend cooperation with coach Piotrek. His professionalism, knowledge and individual approach to everyone make him unique. Piotrek perfectly adapts the training to my abilities and needs."
A member in March 2025: "Celebrated my daughter's birthday there. Was great fun! The sports hall was all decorated with colourful balloons and the animators did great job assisting kids and entertaining them."
Read those two again. One is reviewing a personal trainer. The other is reviewing a children's birthday party. Neither is reviewing the gym floor at seven in the evening.
That's the shape of this record: the positive reviews and the negative one are describing different products under one roof. There's a sports hall, animators for kids' parties, and personal trainers. If you're buying any of those, the one-star review may not touch you at all. If you're buying a membership to lift after work, it's aimed directly at you.
A member in September 2019: "Well equipped gym. Personal trainers available, organized group trainings."
A member in June 2023: "It's one of the best gyms I have ever visited. Comparable packages and great set of sports equipment."
"Best gym I have ever visited" without naming a single one he's comparing against is an opinion wearing the costume of evidence.
What's Missing
No prices. Three hundred and forty-five reviews and not one figure, though the one-star says there's no multisport card and the price isn't competitive.
No opening hours on the listing at all.
Who It's Not For
Anyone training in the evening, unless you've seen it at that hour yourself.
Anyone who relies on a multisport card, going by January 2025.
Kazimierza Gierdziejewskiego 7, 02-495 Warszawa. The site is oxygenfitness.pl and the number is +48 692 250 559.
FAQ
Is it crowded?
A member who trained there for two months at varying hours reports evening queues of 5 to 15 people per machine. Nobody else on the record addresses it.
Do they take multisport cards?
He says no. He's the only source.
Is there more than a gym?
Yes. Reviews describe a sports hall used for children's birthday parties with animators, plus personal trainers and group classes.
What does it cost?
No review names a price.