Originally Posted by bigblackcrank

Pedal standing on a stationary bike with the heels down can do the trick. Pedaling heels down will relax and disengage your calves and doing it while standing will likely engage the glutes (butt muscles) and also the hamstrings on the downstroke. I found it effective workout for both the glutes and hamstrings if either muscles is weak. You'll need to ease yourself into this training. Start easy or you can potentially injure your ankle joint as you relax the calves by pointing the heels down.