In the early 2000’s, we built out our flex engineering office to include an exercise room and a shower. We had a full set of weights. It was only used about 5% of the time. It looks good for recruiting new employees, but in reality people probably won’t use it. I would still put in a shower, and maybe a room and mats for stretching, body weight exercises, and maybe some resistance bands. But that’s about all I would do if I were to do it again. The shower is useful for bikers and lunchtime joggers.