Trying to target your glutes and thighs? Don’t hold onto the handles of your treadmill or stair-climber: many gym goers crank up the speed and hold on or lean to meet the momentum, but this actually reduces the efficiency of your workout, and because of this, the Caloric output you expend wont match the readout on your machine. It will be far less. -www.fitnessphysician.com