If you haven't given water workouts a try, I've got news for you: you're missing out on one of the best low-impact workouts you can do! Swimming and water aerobics are the ideal way to get your heart rate up while being easy on your joints. The buoyancy of water lessens the pull of gravity, making you feel lighter and more balanced, while also reducing the impact on your knees. (This also makes the same moves that would be difficult to do on land feel easier in the pool.) This water workout will help you burn calories and build strength at the same time by combining high intensity cardio moves with plyometric exercises.