Try This: 'The Biggest Loser's' Bob Harper says the air squat is tops for getting in a lower body wo

Try This: 'The Biggest Loser's' Bob Harper says the air squat is tops for getting in a lower body workout that will also raise your heart rate.;;Ready for a butt-and-thigh burner that you can do anywhere? Meet the air squat. It's like your regular squat, only 10 times harder. Bob Harper, best known for his work on NBC's "The Biggest Loser," says the air squat can't be beat for getting in a lower body workout that will also boost your heart rate. ;;What it does;;Tightens the lower body - the glutes, hamstrings, quadriceps and inner thighs - in a powerful way, because the range of motion is much deeper than with the typical squat. It also tightens the core, especially the lower abs, and raises the heart rate.;;STEP ONE: Stand with your feet a bit wider than your shoulders, toes turned out about 45 degrees.;;(^^^ / Los Angeles Times via Getty Images.) (Photo by Rob Gauthier/Los Angeles Times via Getty Images)