Hmmmm, never seen a health club like this. Cool. Overall, your composition is blurry, but not bad. I like the plant in the corner, it helps to "desterolize" in otherwise hi-tech pic.
This is a great pic. The 2-D arrangement of the five nearest bodies is fantastic. I think you could have got an even greater sense of distance, if the nearest figure was sharper. Very good.
The shot idea is superb but the focus is not as it could have been; perhaps using flash would have helped, but (in order to maintain anonymity possibly?) you didn't use one. Because the focus is so soft, the shot loses a lot of impact. Composition is first class – even looks like you might have been hiding behind a plant in order to get the shot :o) Good luck…
I wonder if this shot would have been possible from the other side? This is candid, but the candid element could have been stronger with some faces in the photo :) - jmsetzler