This 15-Minute Step Workout Is Easy on the Knees — but Will Seriously Make You Sweat

Langhans says this move adds a strength element into the mix, and focuses on the quads, glutes, and hamstrings, while encouraging flexion in the knees, a tall T-spine, and an engaged core.

• Start with the left foot on stepper (length-wise), and the right foot on the floor, body in squat position. The left hand taps the stepper. Remember: the chest should be tall with a neutral spine.
• Step the right foot onto stepper, and the left foot onto ground in a squat position.
• Continue alternating squats off the stepper. Perform this move for 45 seconds.