I'm setting up a project that tries to connect good causes with people who exercise,  the plan is to make it really easy for people to help each out in small ways at the same time as getting fit.  For example instead of doing a normal run or running on a treadmill people will be connected with elderly immobile people in the area to whom they can deliver useful things and check they are ok.  I'd really like some of your expert feedback on the idea.  There's a website up at www.thegoodgym.org,  what do you think?