Fitness Tips: Build Muscle Faster

5 Laws for a Lean Body

Apply these scientific principles to your workout and get better, faster results

Learn to Twist

Most exercises happen in one of two geometric planes—the sagittal (up and down, and front to back) and the frontal (side to side), says certified strength and conditioning specialist Andre Farnell, owner of Better Body Expert Fitness Solutions in New York City. But there's a third plane, called the transverse—the realm of rotational movement. Adding motion in that third plane engages your core, which increases the number of muscles recruited and therefore calories burned. And these movements are more in tune with how we naturally function. "When we walk and do everyday activities, we use all three planes," says Farnell. "But most Americans neglect the transverse plane in the gym." So working this principle into your routine will give you strong, show-off-worthy abs—plus, it will make daily tasks like hauling groceries feel easier.

Apply it: Rotate your body to the right or left in exercises such as the walking lunge and situp, or bring your knee across your body during moves like the mountain climber.

The Lose-Your-Belly Workout
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