20-Minute Treadmill Workout If you're looking for a workout that will blast calories in no time at all, check out this 20-minute treadmill workout that's great for when you're short on time. Best Pinterest Workouts of 2014 | POPSUGAR Fitness
Lie facedown over a bench or padded stool with your legs hanging off the edge (a). Engage your abs and lift both legs until your body forms a straight line (b). Hold for 5 seconds, then lower slowly. That's 1 rep; do 10 to 15.