My horse is 5 yrs. old and was just broke. When we got her she really hadn't been ridden much and not consisitenly. And when she was ridden it was mainly only at the walk. So she really doesn't have any muscles. How can I build up her muscles? Her shoulder, hind, leg, neck etc. muscles. Trail riding is out of the question for now.....no trails. But there is a big grassy area where I can ride her in the snow when it snows and we have an indoor arena. Would riding in the snow build up her muscles because she would have to push it with her legs? Also what other things can I do in the arena to build up her muscles for riding? Lunging? Trotting? Cantering? I'm not sure what is the best thing to do. The area where the saddle goes is NOT slopped down, its just fine......so we don't have to worry about building that up.