Knee Touch Crunch

Body Part: Waist

Muscle: Abs

Equipment: Body Weight

Knee Touch Crunch is a bodyweight floor crunch that emphasizes spinal flexion and controlled abdominal shortening. In the image, the lifter stays on the floor with the knees bent, feet planted, and the upper body curling up to reach toward the knees. That makes this a simple but very specific core drill: the abs should do the lifting, while the hips and neck stay quiet enough that every rep looks smooth and repeatable.

The exercise mainly trains the rectus abdominis, with the obliques and deep core helping stabilize the torso as you curl and return. Because the range is short, the details matter more than brute force. Where you place the feet, how much you lift the shoulder blades, and whether you keep the ribs tucked all determine whether the set feels like a true ab contraction or just a fast sit-up pattern.

Start on your back with your knees bent and your feet flat, then set the hands along the thighs or reach them toward the knees. From there, exhale and curl the ribs toward the pelvis while lifting the shoulders and upper back just enough to touch or approach the knees. The return should be slow and controlled so the abs stay under tension instead of letting gravity drop the torso back to the floor.

Knee Touch Crunch works well as an accessory core movement, a warm-up drill, or a higher-rep abdominal exercise when you want low setup and clean execution. It is also useful for beginners because the movement is easy to scale by reducing the reach or lifting only the shoulder blades. The exercise becomes less useful when the hands yank on the legs, the hips take over, or the neck starts doing the work.

Keep the motion crisp, the breathing steady, and the lower back comfortably anchored. If your neck or hip flexors dominate, shorten the range and focus on curling the ribs rather than chasing a bigger touch. Done well, Knee Touch Crunch is a straightforward way to build better abdominal control without needing equipment or complex setup.

Instructions

• Lie on your back with your knees bent and your feet flat on the floor about hip-width apart.
• Place your arms along your thighs or reach your hands toward your knees with your chin slightly tucked.
• Press your lower back lightly into the floor and set your ribs down before you start.
• Exhale as you curl your shoulders and upper back off the floor.
• Reach your hands toward your knees without pulling on your head or yanking with momentum.
• Lift only as high as you can while keeping the abs tight and the neck relaxed.
• Pause briefly at the top when your hands touch or nearly touch your knees.
• Lower your shoulders back to the floor under control while keeping tension in the abs.
• Reset your breath and repeat for the planned number of repetitions.

Tips & Tricks

• If your neck starts working, look slightly toward your thighs instead of trying to lift your chin higher.
• Keep the movement small; the goal is a hard abdominal curl, not a full sit-up.
• Let the hands slide up the thighs rather than swinging the arms, especially on higher reps.
• Pressing the low back into the floor before each rep helps keep the abs in charge.
• Exhale as the shoulders leave the floor so the ribcage can close and the abs can shorten cleanly.
• If the hip flexors cramp, bring the feet a little closer to your hips and reduce the reach.
• Touching the knees lightly is enough; do not jerk forward to force contact.
• Use a slow lowering phase so the set does not turn into repeated floor drops.

Frequently Asked Questions

What muscle does Knee Touch Crunch target most?

It mainly targets the rectus abdominis, with the obliques and deep core helping stabilize the torso.

Can beginners perform this exercise?

Yes. Beginners can keep the range short and focus on lifting the shoulder blades instead of trying to sit all the way up.

Where should my feet be during the crunch?

Keep the knees bent and the feet flat on the floor so the torso can curl without the legs swinging around.

How high should I lift my shoulders?

Lift just enough for the shoulder blades to clear the floor and the hands to reach the knees without turning it into a sit-up.

Why do I feel this in my hip flexors?

If the legs are driving the motion or the knees are too far from the hips, the hip flexors can take over. Shorten the reach and curl the ribs down.

Do my hands have to touch my knees?

No. Touching the knees is fine, but reaching close to them with a controlled curl is enough if your range is shorter.

What is the most common mistake?

Pulling with momentum or yanking the head forward instead of curling the torso with the abs.

How can I make Knee Touch Crunch harder?

Slow down the lowering phase, pause at the top, or keep the shoulders hovering a little longer on each rep.