What KK said is spot on. I experienced the cold muscles situation many years ago when I got caught up in the, shooting extra high poundage, phase. Buck of a lifetime came in under my stand in late November. I had been sitting in the negative temperatures too long. When he finally presented a shot, I couldn't pull by bow past break over. I would never have believed it since I had no problems shooting it in warmer temperatures. Shortly there after I got a bow 10 lbs draw lighter and have not had a problem since. So like KK said, start out at a lighter, comfortable poundage because as your muscles start to build up, you will be able to slowly increase it.