“By the numbers, a 180-lb. man can burn about 940 calories in an hour while running an 8.5-minute-per-mile pace—or 7 mph on the treadmill for an hour,” says Ryan. “This would be a nice, long run to do every couple of weeks to keep up your aerobic capacity, but it involves a lot of mileage for the time and effort put in.” The cons: Running at this pace can also break down muscle and subject your body to lots of pounding. “If you’re looking to add in a long run every once in awhile, by all means do so, just opt for trails or softer surfaces than cement and blacktop,” he says.
Because cycling is primarily a lower body sport, riders can lose muscle volume in their upper body. The solution? Year-round resistance training. This doesn’t mean you have to spend hours in the weight room—as little as 20 minutes twice a week during the cycling season and 30 minutes two or three times a week during the winter will maintain and even increase your upper-body muscle mass.