When walking on a treadmill, people typically hit the tread in a "heel-to-toe pattern" and work the hamstring muscles on the back of the thigh, he explains. Whereas on a stair climber, "the pressure ...

Jacqueline Kasen, CPT, is a Miami-based coach, master trainer, and senior director of group fitness at Anatomy with the StrongFirst Kettlebell certification. Ahead, find out why stair climber ...