"Basically, we know each pokemon has a thing they excel in, so we have it set up that trainers can sign up for helping a pokemon gain experience with any attribute that they would like.
Of course, it's themed with the gym, and trainers may be subject to the same training. For example, the speed test is the Fortress Challenge, while the endurance test is just giving a light, non harmful dose of croagunk poison to you and your pokemon and slowly increasing the dose while having you work out, until the paralytic effects kick in. We are a poison gym, after all."

You enter a savannah like area. 100 feet to your left is a matriarchy of nidoran, with a nidoqueen watching over young nidorans and what seem to be adolescent nidorino anxd nidorina. Up ahead, you see a few odd groupings of rock that may be worth checking out. Somewhere in the distance, you hear crooning pokemon, possibly singing to younger generations. To the right is a grove of trees, which you think you hear something in.
Which way?