How Powerful Is Your Workout?

Of course, riding a real bike rather than driving a car saves much more energy than riding a stationary bike attached to a generator, said Clark Williams-Derry, research director for the Sightline Institute, an environmental research center in Seattle.

Of course, riding a real bike rather than driving a car saves much more energy than riding a stationary bike attached to a generator, said Clark Williams-Derry, research director for the Sightline Institute, an environmental research center in Seattle.