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However, jump rope this figure doesn't take into account the difference between net and gross caloric expenditure. The gross number of calories burned was 255. In contrast, the net figure (remember, the net figure represents the "real" number of extra calories you've burned) was just 187 calories. In other words, if you rely on the numbers given by the calorie jump rope counters, it might appear that you've burned more calories than you jump rope really have. Muscle loss When you lose weight from dieting alone, some of the weight lost comes from lean muscle tissue. Some experts believe that aerobic exercise prevents this reduction in muscle mass. But the facts tell a different story. Several studies show that diet and aerobic exercise both lead to a drop in muscle tissue [10, 15]. Aerobic exercise won't offset the loss in lean muscle caused by dieting. When you lose weight by dieting, roughly seven of every 10 pounds lost over a 12-week period come from fat.
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