I wasn't saying that is the only thing you need, but in my opinion climbing rock is much easier that ice climbing, physically. Doing some weight training before the season starts makes the transition a lot easier. You don't need to bulk yourself up like a gorilla, but training your muscle to repeatedly: swing ice axes overhead, carry extra 10lbs of gear give or take some, climb steep snow slopes to approach climbs, screw and unscrew ice pro, and kicking front points all day long makes the transition from rock to ice much easier.