I live where it is an hour and a half round trip to the nearest place I can practice my bow. I keep my arms in shape by going to the gym, where I do some exercises on one machine that is very similar to drawing a bow (in addition to my"normal" routine). It doesn't help much with aiming, etc., but it does pretty much eliminate the pure physical atrophy part of not being able to shoot your bow, so you can shoot it more times and get more practice in when you get your bow back.