Tried pulling my bow today. Couldn't get it back. Have been out of bow action for a while due to health issues, but didn't realize I had gotten so puny. Any suggestions on best exercise to strengthen bow drawing muscles? Or the ones to avoid? I'm pretty sure it's not the bow. I took a turn off of the draw weigh screws and could finally draw it. It shot in the middle, but about 6" low at 25 yd, so I figure the problem is me.