Seated Knee Tuck: How to Do It Correctly

Step-by-step form

1. Setting up

   Sit on the mat, place the hands slightly behind the hips, and point the fingers sideways or forward. Lean the torso back slightly with the chest open, spine long, and feet lifted from the floor. Start with knees bent, abdominals active, and balance without rounding the lower back.

2. The movement

   Draw the knees toward the chest while bringing the torso slightly toward the thighs. Then extend the legs under control as the torso opens slightly backward without letting the lower back collapse. Pull the knees back in before the feet touch the floor. The movement should flow through hip flexion and abdominal control.

3. What stays in line

   The chest should not collapse; keep the upper back long while the abdominals control the pelvis. Shoulders should not shrug toward the ears, and elbows stay slightly bent. If the lower back rounds or collapses as the legs extend, the range is too large. Knees should track near the midline without swinging side to side.

4. Breathing

   Exhale for 1-2 seconds as the knees tuck in. Inhale through the nose for about 2 seconds as the legs extend while maintaining abdominal pressure. If balance breaks, reduce range instead of holding your breath.

Common mistakes

1) Rounding the lower back: if the torso collapses, passive back tissues take load instead of the abs. 2) Hitting the feet on the floor: this shows loss of control and excessive range. 3) Hanging on the shoulders: if the hands do most of the work, the abdominals lose the training effect.

Recommended sets and reps

Recommended sets and reps

Beginner: heel-tap 2 sets x 8-12 reps. Intermediate: feet-hovering 3 sets x 12-20 reps. Advanced: hands-free or slow tempo 4 sets x 15-25 reps.

Tempo

Beginner: 2-0-2-0 (2 s tuck, no pause, 2 s extend). Intermediate: 1-1-2-0 (1 s tuck, 1 s top squeeze, 2 s extend). Advanced: 1-2-3-0 (1 s tuck, 2 s top hold, 3 s controlled extension).

How often

Can be used 2-4 days per week as core accessory work; leave 48 hours if lower-back or hip-flexor sensitivity exists. Low-volume technique sets can be repeated after 24 hours. Avoid stacking high volume with leg raises on the same day.

What it trains

Develops lower-abdominal and hip-flexor endurance. The seated balance position challenges pelvic control and trunk stability at the same time. It fits quickly into no-equipment core circuits and offers a more dynamic alternative to leg raises.

If something hurts

Knee

Knee pain usually comes from bending/extending too fast or hard-locking the knees at full reach. Keep the knees softly bent, reduce range, and avoid aggressive lockout. If pain is sharp inside the joint, stop and consult a healthcare professional.

Lower back

Lower-back pain occurs when the pelvis rolls backward uncontrollably and the back rounds as the legs extend. Keep the torso more upright, tap the heels down, and shorten the leg reach. If pain does not resolve within 1-2 reps or radiates into the leg, stop and consult a healthcare professional.

Shoulder

Shoulder pain can occur when the hands are too far behind the body or the shoulders shrug toward the ears. Move the hands closer to the hips, soften the elbows, and keep the chest open. If pain is sharp or radiates down the arm, stop and consult a healthcare professional.

When to skip it

Avoid with acute low-back pain, sciatic flare, hip-flexor tendinopathy, early recovery after abdominal surgery, significant diastasis recti, or tailbone pain in seated positions. Dead bug or heel taps are more controlled alternatives.

Where to go next

Moves that train the same thing — and, where this one sits on a ladder, the rungs either side of it.

• Step-up→
• Wide Table Inverted Row→
• Bicycle Crunch→
• Decline Push-up→
• Diamond Push-up→
• Donkey Kick→