Well, this might be a bit off-topic, though it also might be usefull.
I've been looking around and a lot of talk on the captacha's and avoid refreshers as been dumped into the forums. It's basicly impossible to completly stop refreshers, and pointed quite well by Nyna, a random one, will go basicly do the trick, even with captcha's usage. I was wondering, if, making the captcha pop out let's say on the gym, right after the user hit the "Train" button, if that wouldn't be just a bit more effective than the regular captcha when entering the gym?