Exercise guide
Bosu Ball Step-Up High Knee
- Intermediate
- Compound
- Timed hold
- Lower legs
- Upper legs
This exercise builds explosive lower body power and dynamic stability by challenging the core and ankle stabilizers on an unstable surface. It effectively targets the glutes and quads while the high knee drive engages the hip flexors and deep abdominals.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Place the Bosu ball on a flat surface with the blue dome side facing up.
- Stand approximately 6-12 inches behind the Bosu ball with your feet hip-width apart and arms at your sides.
- Engage your core and maintain a neutral spine with your gaze fixed forward.
How to do it
- Place your lead foot firmly in the center of the Bosu dome, ensuring the entire foot is supported.
- Exhale as you drive through the lead heel to stand up, simultaneously bringing the trailing knee toward your chest until the thigh is parallel to the floor.
- Hold the top position for a split second to find your balance, keeping the standing leg slightly soft rather than locked.
- Inhale as you slowly lower the trailing foot back to the starting position on the floor, maintaining control through the lead leg.
Form checklist
- Keep your chest lifted and shoulders back throughout the entire movement.
- Ensure the knee of the stepping leg tracks directly over the toes, avoiding any inward collapse.
- Drive the opposite arm forward as the knee rises to mimic a natural running motion and aid balance.
- Maintain a tight core to prevent the Bosu ball from wobbling excessively during the transition.
Pro tips
- Focus on 'rooting' your foot into the dome by spreading your toes to maximize sensory feedback and stability.
- At the peak of the movement, perform a hard 'crunch' with your abs to stabilize the high knee position and improve balance.
Make it harder
- Hold a pair of dumbbells at your sides or a single kettlebell in a goblet position to increase the resistance.
- Add a small explosive hop off the Bosu ball at the top of the movement to increase power and cardiovascular demand.
Frequently asked
- What muscles does the bosu ball step-up high knee work?
- The bosu ball step-up high knee primarily targets the calves, glutes, hamstrings, and quadriceps, and also works the serratus anterior as secondary muscles.
- What equipment do you need for the bosu ball step-up high knee?
- The bosu ball step-up high knee uses step.
- Is the bosu ball step-up high knee good for beginners?
- The bosu ball step-up high knee is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.
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