Scissor Kick
The scissor kick is a bodyweight core exercise performed face-up with alternating leg movements, targeting the lower abdominals and hip flexors to build the core endurance HYROX athletes need for running posture and lunge station performance.
Definition
The scissor kick is a bodyweight core exercise performed lying face-up, alternating legs in a controlled up-and-down scissoring motion while keeping both legs elevated off the ground. This movement targets the lower abdominals and hip flexors through sustained anti-extension and leg coordination. For HYROX® athletes, scissor kicks build the lower core endurance needed to maintain pelvic stability across 8 km of running and multiple loaded stations.
Technique & Form
- Lie flat on your back with arms at your sides, palms pressing into the floor. Tuck your chin slightly and press your lower back firmly into the ground.
- Lift both legs 15-20 cm off the floor. This is your starting position - your lower back must remain in contact with the floor.
- Raise your right leg to approximately 45 degrees while keeping your left leg hovering just above the ground.
- In a controlled motion, switch: lower your right leg while simultaneously raising your left leg. The movement should be smooth and continuous.
- Continue alternating for the prescribed rep count or time. One full up-down cycle per leg equals one rep.
Muscles Worked
- Primary: Rectus abdominis (lower fibers), hip flexors (iliopsoas)
- Secondary: Obliques, quadriceps (isometric)
- Stabilizers: Transverse abdominis, erector spinae
Common Mistakes
- Lower back lifting off the floor: This indicates the core cannot maintain the load. Raise your legs higher or reduce the range of motion until you can keep your back flat.
- Moving too fast: Rapid kicking uses momentum rather than muscle control. Aim for 2 seconds per full scissor cycle.
- Holding breath: Breath-holding during sustained core work spikes blood pressure and reduces endurance. Breathe rhythmically throughout.
Benefits
- Strengthens the lower abdominals and hip flexors for improved running posture
- Develops muscular endurance through extended time under tension
- No equipment required - ideal for warm-ups, hotel rooms, and circuit finishers
- Trains the alternating leg coordination pattern used in running
HYROX® Context
Scissor kicks build the lower core endurance that prevents anterior pelvic tilt during the later running segments of a HYROX® race. When core muscles fatigue after stations 5-8, athletes with weak lower abs lose running economy, slowing their 1 km splits by 10-20 seconds. Scissor kicks also develop hip flexor endurance that supports high-rep lunges at the Sandbag Lunges station. Include 3 sets of 30-40 reps in your accessory or warm-up work.
Variations & Alternatives
- Reverse Crunch - focused lower abdominal isolation with less hip flexor involvement
- V-Up - dynamic full-range core exercise for greater intensity
- Sit Up - classic trunk flexion for general core strength
FAQ
How many scissor kicks should I do? Start with 3 sets of 20 reps per leg (40 total movements). Progress to 30-40 reps per leg or add 30-60 second timed sets.
Are scissor kicks bad for your back? Only if performed incorrectly. Keeping your lower back pressed into the floor throughout the exercise protects the spine. If your back arches, raise your legs higher or reduce volume.
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