Shovelingthat driveway will tone your entire body and torch nearly 400 calories an hour. "But as with any other workout, you can injure yourself if youdon't take the proper precautions," says Donna Stein-Harris, with theNational Safety Council in Itasca, Illinois. She recommends spacingyour hands a foot apart on the handle for more lifting leverage andsquatting down with your legs apart and back straight rather thanbending at the waist. "Let your shoulders, torso, and thighs do mostof the work," says Stein-Harris. Finally, turn your whole body todump the snow instead of tossing it over your shoulder. "A suddentwisting motion," she says, "can cause you to pull a back muscle."