You don't need to spend a lot of time warming up for a workout, but that doesn't mean it's not important. Warming up your major muscle groups helps prevent injury and gets the blood flowing and body warm — essential in this Winter chill! Before your next workout, try this short and efficient routine that works your entire body. Move through each exercise for 30 seconds, then repeat the circuit a second time. In just five minutes, your body will be prepped for an awesome workout.