Re: Calories (or whatever measure of energy expenditure you prefer)
They are pretty much the same, the main difference is that a spin bike is in a room with a lot of identical bikes, and one in the front facing the rest for the instructor. Nothing stops you from doing 'spin' on the 'exercise bike' found out in the main gym next to the treadmills and stair climbers, other than motivation to push yourself as hard as the instructor would.
Biting the hand that feeds IT
