The number one reason people exercise is to lose weight, and aerobic activity is crucial for that… right? Sure, you may lose weight—but at what cost? If you do an excessive amount of aerobic work, rest assured you’ll catabolize muscle tissue. And the less muscle you have, the lower your metabolic rate—not to mention a…

I just got back from a 10-day vacation in Florida, where I managed to train six times—twice at a gym, twice in our condo (check out the photo of me doing “piggyback” split squats with my son on Twitter), and twice at a beach workout area in Fort Lauderdale. But the most memorable training session…