By Kristen Domonell for Life by DailyBurn Ready to hit the slopes this winter? If you spend most of your week cooped up at a desk, weekend ski and snowboard trips could leave you with strained muscles and a sore back. But with the right preparation, including strengthening your hamstrings, quadriceps, back and core, you won’t have to risk injury or suffer from the usual aches and pains, says Mike Morin, alpine program director at Stratton Mountain School, who coached the U.S.