Give up? You need to develop muscle to accomplish any of them. One reader asks: What's the balance between cardio and strength training to get the most muscle?
Our answer: Spend more of your time in the weight room.
Low-intensity aerobic exercise (jogging, biking, swimming) burns a heck of a lot of calories. But as scenic as it can be, it builds little—if any—muscle.
Why? When you're working out for 20 or more minutes, your body eats its way through your immediate energy sources, like fat and glycogen, and rummages for the next power supply: fat-scorching, muscle-building protein.
Lifting, on the other hand, won't burn as many calories as a run, but it will burn fat for up to 48 hours after your workout. For long-term weight management and muscles that pop, choose iron over the treadmill.