High Knees

Definition

High knees is a bodyweight cardio/explosive exercise where the athlete runs in place (or with forward movement) while driving the knees as high as possible toward the chest with each stride. It develops hip-flexor power, cardiovascular conditioning, and running cadence - all critical for HYROX^® running performance.

Technique & Form

1. Starting position - Stand tall with feet hip-width apart, arms at the sides.
2. Drive phase - Lift the right knee to hip height or above while simultaneously pushing off the left foot. Drive the opposite arm forward.
3. Cycle - Rapidly alternate legs, maintaining an upright torso and fast cadence.
4. Breathing - Quick, rhythmic breaths in sync with the cadence.
5. Tempo - As fast as possible while maintaining knee height. Aim for 180+ steps per minute.

Muscles Worked

• Primary movers: Hip flexors (iliopsoas), quadriceps, calves
• Stabilizers: Core, glutes, hamstrings

Common Mistakes

• Leaning backward - Reduces hip-flexor engagement. Fix: maintain a slight forward lean.
• Low knee height - Not driving knees high enough. Fix: aim for hip height minimum.

Benefits

• Develops hip-flexor power for running knee drive.
• Builds cardiovascular conditioning with minimal space.
• Improves running cadence and foot turnover speed.

HYROX^® Context

High knees develop the hip-flexor speed and cardiovascular fitness that improve HYROX^® running pace. They are especially useful in warm-ups before running sessions and as a conditioning drill during circuit work. Program 3-4 sets of 20-30 seconds during warm-ups or conditioning circuits. Pair with easy runs and interval runs for complete running development.

Variations & Alternatives

• Easy Run - Low-intensity aerobic base building.
• Jump Squat - Explosive lower-body power.
• Inchworm - Full-body warm-up movement.

FAQ

Are high knees a good warm-up? Yes. 2-3 sets of 20 seconds progressively raise heart rate and activate the hip flexors before running.

How long should I do high knees? For warm-ups: 20-30 seconds. For conditioning: 30-60 seconds within a circuit.

Build running cadence and hip-flexor power with ROXBASE.