If you've got snowshoes, strap 'em on and head outside. Snowshoeing is great exercise.
Snowshoes come in a variety of shapes and sizes.
Float refers to how effective the snowshoe is at keeping you on top of the snow in other words, float is what keeps you from sinking and postholing. The heavier you are, the more float you'll need. If you're planning a backpacking trip, the weight of a winter pack will almost undoubtedly put you into the high-float category. Narrower or tapered snowshoes are a little easier to walk in, because they track better through the snow, and because you can walk with your legs in a more natural stance. But wouldn't you know it, snowshoeing has undergone a recent renaissance, and the manufacturers, bless their inventive little hearts, have followed suit.