http://well.blogs.nytimes.com/2012/03/14/do-statins-make-it-tough-to-exercise/

 Key quote:

“So what does the emerging science about statins and muscles mean for someone who is taking or considering the drugs? “Statins save lives,” Dr. Thompson says. “Most people cannot control their cholesterol with diet and exercise alone.” He advises athletes to stop taking the drugs several days before a competition or strenuous workout, to avoid exacerbating muscle damage. But if you have intractably high cholesterol or a history of heart disease or stroke, he says, “you should be on statins.””

Dr. Paul Thompson, the chief of cardiology at Hartford Hospital in Connecticut and senior author of the study that finds that statins damage muscle.