How did you determine that your snake needed exercise?
Ya know, never mind, I'm gonna say BS. It doesn't need exercise, you wanted to show off. It's your right, but somehow I think you're going to wind up not doing reptile keepers in general a service by doing this.
You're not the first to have made this claim, nor the last, but I'll tell you straight up, it's not really a good idea. Do you have a backyard? Why not be safe, for your snake and all your fellow keepers, and use that as your snake gym?