Exercise guide
Mountain Climber
- Beginner
- Compound
- Timed hold
- Lower legs
- Upper legs
- Waist
The mountain climber is a dynamic core exercise that builds cardiovascular endurance while simultaneously challenging the shoulders, abs, and hip flexors. It effectively mimics the mechanics of sprinting while maintaining a stable plank position to improve total-body coordination.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Start in a high plank position with your hands placed slightly wider than shoulder-width apart.
- Align your wrists directly under your shoulders and extend your legs fully behind you.
- Engage your core and glutes to create a straight line from your head to your heels.
How to do it
- Drive one knee toward your chest as far as comfortable without rounding your lower back.
- Quickly switch legs in a fluid, 'running' motion, bringing the opposite knee forward while extending the first leg back.
- Maintain a steady, rhythmic breathing pattern, exhaling with each knee drive.
- Keep your hips level and avoid letting them bounce or pike toward the ceiling.
Form checklist
- Keep your shoulders stacked directly over your wrists.
- Maintain a neutral spine and avoid tucking your chin to your chest.
- Keep your core braced and your hips low throughout the set.
- Ensure your toes make light, quick contact with the floor.
Pro tips
- Focus on the 'pull' of the knee using your lower abs rather than just moving your legs.
- Push actively into the floor to keep your shoulder blades protracted and stable.
Make it harder
- Perform the movement with a 'cross-body' pattern, driving the knee toward the opposite elbow.
- Slow the tempo down significantly to focus on time under tension and isometric core stability.
Frequently asked
- What muscles does the mountain climber work?
- The mountain climber primarily targets the abs, deltoids, and obliques, and also works the hamstrings and hip flexors as secondary muscles.
- What equipment do you need for the mountain climber?
- The mountain climber requires no equipment — just your body weight.
- Is the mountain climber good for beginners?
- Yes. The mountain climber is a beginner-friendly movement and a strong foundation to build on.
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