Mountain Climber

How to do it

1. Set up in a high-plank position with your hands directly under your shoulders and arms locked out.
2. Brace your core hard and squeeze your glutes to keep your hips level with your shoulders.
3. Drive your right knee toward your chest, keeping the foot off the floor at the front of the motion.
4. Snap the right leg back as you drive the left knee forward in a smooth, alternating rhythm.
5. Keep the hips low and the shoulders stacked over the wrists the entire set.
6. Continue for 20 to 40 seconds at a controlled pace, prioritizing form over raw speed.

Common mistakes

• Letting the hips bounce up and down, which removes the core demand and breaks the plank shape.
• Sagging the lower back as the legs drive, which strains the spine instead of loading the core.
• Putting the hands too far in front of the shoulders, which collapses the plank and stresses the wrists.
• Going too fast and losing range of motion, with knees barely moving instead of driving toward the chest.