<a href="http://www.nbcnews.com/id/25949447/" target="_blank">It's touted as a couch potato's dream</a>, but the ramifications and potential uses go far beyond fixing a lazy person's body.
Think of those who, through no fault of their own, cannot exercise or cannot exercise enough. Those with challenging health problems - heck, I frequently dislocate knees, ankles, and hips just by walking down the stairs. What about people in wheelchairs? What about a comatose or bed ridden patient? Isn't forestalling bone density and muscle mass loss a good idea, enabling future rehabilitation?
For that matter, think of space-faring people living in zero gravity, losing muscle mass and bone density by the minute. Or colonists who settle on a 0.4 gravity planet.
Or maybe, just maybe, this, or a later derivative, is what Mark Vorkosigan took to lose weight when he returned to Barrayar in <i>A Civil Campaign</i>. :D
What other kinds of uses can you think of for exercise in a pill? How would you work this into a story?
…and so of course, what happens but a spamminator of a post on weight loss. You can’t fool me, ye evil spammers!