Exercise guide
Kneeling Hip Flexor Frontal
- Intermediate
- Compound
- Rep-based
- Lower legs
- Upper legs
- Waist
This unilateral exercise targets the quadriceps and hip flexors through a controlled lengthening phase, improving both lower body mobility and functional stability.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Start in a half-kneeling position with your trailing knee on the floor and your lead foot planted firmly in front.
- Ensure both knees are at approximately 90-degree angles with your feet hip-width apart for balance.
- Maintain an upright torso with your hands on your hips and your gaze forward.
How to do it
- Inhale and engage your core, performing a slight posterior pelvic tilt (tuck your tailbone) to stabilize the hips.
- Exhale as you slowly shift your weight forward into the front leg, keeping your torso vertical and your trailing glute squeezed.
- Inhale as you use the lead leg to push your body back to the starting 90-90 position.
- Perform the movement at a controlled 2-1-2 tempo (2 seconds forward, 1 second hold, 2 seconds back).
Form checklist
- Keep your chest tall and avoid leaning forward at the hips.
- Ensure the front knee stays aligned with the middle of your foot, not caving inward.
- Maintain a tight core to prevent your lower back from arching excessively.
- Keep the trailing glute engaged throughout the entire range of motion.
Pro tips
- Squeeze the glute of the kneeling leg as hard as possible to maximize the stretch and engagement of the quadriceps through reciprocal inhibition.
- Think about driving your kneeling shin into the floor to create more stability and tension in the target muscles.
Make it harder
- Elevate the rear foot on a bench or block to increase the stretch on the quadriceps (Couch Stretch variation).
- Reach both arms overhead during the forward shift to increase the tension through the entire anterior chain.
Frequently asked
- What muscles does the kneeling hip flexor frontal work?
- The kneeling hip flexor frontal primarily targets the quadriceps, and also works the abs, glutes, and hip flexors as secondary muscles.
- What equipment do you need for the kneeling hip flexor frontal?
- The kneeling hip flexor frontal requires no equipment — just your body weight.
- Is the kneeling hip flexor frontal good for beginners?
- The kneeling hip flexor frontal is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.