"You're at the gym, ready to do your cardio. Today, don't do the exact same thing you always do. It's time for a change. Each of the following four workouts uses a different piece of equipment and tells you exactly what to do. Check with your doctor first before starting a new routine, especially if you have any medical problems, take any medicines, or are pregnant. “By having an arsenal of workouts like these at your fingertips, you always have something you can do, even if all the treadmills are taken at the gym, and options for shorter or longer workouts, depending on your time,” says certified personal trainer Nicole Nichols, who created the following workouts. Pick your machine and start moving!"