My three year old is one of the most active kids I've met, and he loved shoveling for a week straight. Actually the day he didn't get out and shovel is the day he knocked his tooth out, his dad pushed it back where it belongs. (Story for another day, maybe.)
We had J's birthday party that Friday. He really wanted his friends to walk home from school with him, so I told him I'd meet him near the end, I thought we'd never get home because Turbo needed to shovel all the walks. Turbo and I took an extra 10 minutes or more to get home than the other kids.