What would you think to a gym?
Running for 15 minutes a week would give you a speed buff for one week
Pumping iron for 10 minutes a week would increase your melee damage for a week
Just been talking with Meph the weapons admin and he had the idea when we first released Era and he's still thinking it would be better. I wouldn't want people to run for more than 15 minutes or so though- it would get boring.