Nothing could be simpler than doing step-ups, and yet there may be no move that's avoided more. Why? If you're doing them right, "step-ups allow you to put in all the intensity cardio can bring," Kendall explained. Use a stair, step, or even a stack of books to get started.
- With one foot on a step in front of you, alternate feet in a stepping motion.
- Make sure to pump your arms in alternating fashion (left foot, right arm; right foot, left arm).
- Keep your spine straight through the movement, and keep your eyes straight ahead.