Time was when humans didn't have to worry much about getting exercise. When we had to kill, gather, grow, or herd our own food, working out happened naturally. Of course, as soon as we figured out how to avoid those laborious chores, we did. Not long after, we had to come up with new ways of staying in shape; hence, exercise.
Exercising is a laborious, energy-draining, and time-consuming process, so we started making machines to do our workouts for us. While some of these inventions evolved into modern gym equipment, many were as physically useless as they were absurd-looking. Here's a look at effort-free
exercise gizmos through the ages.
(thanks Lisa)