Exercise guide
Prisoner High Knee
- Beginner
- Compound
- Timed hold
- Lower legs
- Upper legs
The Prisoner High Knee is a dynamic bodyweight movement that builds cardiovascular endurance and core stability while improving posture through the 'prisoner' hand position. It effectively targets the hip flexors and lower abdominals while engaging the glutes and calves for explosive upward drive.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Stand tall with your feet hip-width apart and your weight evenly distributed.
- Place your hands behind your head, interlacing your fingers lightly or touching your fingertips to your ears.
- Pull your elbows back and squeeze your shoulder blades together to open your chest.
- Engage your core and maintain a neutral spine with your gaze fixed forward.
How to do it
- Drive your right knee upward toward your chest as high as possible, aiming for at least hip height.
- Exhale sharply as the knee rises, focusing on the contraction in your lower abdominals.
- Lower the right foot back to the starting position and immediately drive the left knee upward in an alternating pattern.
- Maintain a brisk, rhythmic tempo, staying light on the balls of your feet throughout the movement.
Form checklist
- Keep your torso vertical; avoid leaning backward as the knees rise.
- Ensure your elbows stay pulled back and do not drift forward toward your face.
- Land softly on the balls of your feet to minimize impact.
- Keep your core braced to prevent your lower back from arching.
- Drive the knees straight up rather than allowing them to flare outward.
Pro tips
- Focus on 'pulling' the knee up using your lower abs rather than just swinging your legs to maximize core engagement.
- Maintain a proud chest and active upper back to counteract the 'slumped' posture often found in daily life.
Make it harder
- Increase the tempo to a sprint pace to significantly elevate the heart rate and metabolic demand.
- Add a slight cross-body crunch, bringing the opposite elbow toward the rising knee to increase oblique activation.
Frequently asked
- What muscles does the prisoner high knee work?
- The prisoner high knee primarily targets the abs and calves, and also works the adductors and hamstrings as secondary muscles.
- What equipment do you need for the prisoner high knee?
- The prisoner high knee requires no equipment — just your body weight.
- Is the prisoner high knee good for beginners?
- Yes. The prisoner high knee is a beginner-friendly movement and a strong foundation to build on.
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