Less wear and tear. We want to stress that this is only theoretically true; even a car with very low mileage can turn out to be a total beater if it hasn't been cared for properly. But all else being equal, lower miles mean you can expect a longer life from most components, which helps keep ownership costs down.

A typical 150-minute weekly goal is accomplished with 30 minutes a day on five different days.

Extension is when you increase the angle between two bones. Straightening your arms during your elliptical workout works strengthens the triceps -- the muscles on the back of your upper arms. You also work your shoulder, chest and back muscles in the upper body, and glutes, quadriceps and hamstrings in the lower body.