If you're trying to decide between two workouts, it's often a good idea to look at the facts. If you're trying to decide between in-line skating and cycling, know first that the two offer similar cardiovascular benefits. Depending on the intensity of the exercise, both workouts offer an athlete the chance to get an aerobic or anaerobic workout. From there, if your goal is weight loss, you'll want to look at the number of calories burned; if you want to tone certain muscles, consider the muscl...