I pay $42.50/mo for a 24h fitness membership, $80 per session 1-2 times per week with a personal trainer (same person the CEO of reddit uses, heh). I could probably do without the trainer but it has been a good investment so far.

I would like to join a rock climbing gym, maybe do crossfit, and krav magazine at some point, too.

I probably expend $250++ per month in ammunition, too, but I am drawing down a stockpile so I don't have to move it.

$500 on exercise could cover multiple bases as entertainment, socialization, and dating if you add in stuff like climbing, dancing, surfing, etc.