[exabrial]

All right, this is a single Data point, and of course is anecdotal evidence… if you’re into taking health advice off the Internet rather than from your doctor… well you probably will end up disappointed.

OK disclaimers aside now: when I switched to clipless petals on my mountain bike, I dropped 12 lbs over the course of the summer. SPD clipless work the hell out of your calves when they are placed under the ball of your foot, especially in mountain biking applications because you spend so much time out of the saddle.

There is so many lurking variables here and nothing was normalized. I just thought that was an interesting connection.