A free gym membership where you pay $1 for the days you don't show up
It would be better to give credit that can be exchanged for things. Better yet, become the company that sets up turnkey reward programs for active gym members.
Edit: what I mean is that if price ranges from $30-60 the average cost will be a lot nearer that range that's perceived as upscale gym. Whereas ranging from $0-60 would at least appear to be nearer the ordinary $30/month average. It would entirely depend on usage, obviously.