90 Degree Heel Touch
The 90 Degree Heel Touch builds controlled side-to-side core tension, helping improve stability and coordination with simple, steady movement.
90 Degree Heel Touch
Muscles Worked: 90 Degree Heel Touch
The 90 Degree Heel Touch mainly works your abs, especially the muscles that bend your torso and keep your ribs pulled down as you reach side to side. Because your legs stay up at 90 degrees, your midsection has to stay braced the whole set instead of relaxing between reps. The deeper core muscles also help stop your lower back from arching while you keep tension through the movement. You should feel a steady burn across the front of your stomach more than in your neck or hip flexors, which matters because higher-effort training is closely tied to muscle-building changes over time.
Technique and form
How to perform the 90 Degree Heel Touch
- Start by lying on your back with your legs extended and arms at your sides.
- Bend your knees and place your feet flat on the floor, hip-width apart, while keeping your lower back pressed into the floor.
- Engage your core muscles and lift your shoulders slightly off the ground, maintaining a neutral neck position throughout the exercise.
- Extend your arms along your sides with palms facing down, hovering just above the floor.
- In a controlled motion, bend sideways at the waist to touch your right heel with your right hand while exhaling, keeping your shoulders off the ground.
- Return to the center position while inhaling, maintaining core engagement and keeping your shoulders elevated.
- Repeat the movement to the opposite side, bending at the waist to touch your left heel with your left hand while exhaling.
- Continue alternating sides in a fluid motion, focusing on using your obliques rather than momentum to power the movement.
Important information
- Keep your lower back pressed into the floor throughout the entire exercise to protect your spine and properly engage your core.
- Avoid lifting your head or straining your neck—maintain a small gap between your chin and chest.
- Focus on a controlled tempo rather than speed, ensuring you feel the contraction in your oblique muscles with each repetition.
- If you experience lower back discomfort, try bending your knees more or place your feet wider apart for better stability.
Is the 90 Degree Heel Touch good for muscle growth?
Yes. The 90 Degree Heel Touch can help build your abs because it keeps them under tension for a long stretch of the set, especially when you move slowly and keep your lower back from popping up. Research on hard resistance training shows that higher-effort work is linked with muscle-building changes, which supports using challenging bodyweight ab work like this when sets are taken close to fatigue.
- Long time under tension — Your abs do not get much of a break because your shoulders stay off the floor and your legs stay fixed. That makes this tougher than quick crunch reps where tension drops at the bottom.
- Extra demand from the leg position — Holding your hips and knees at 90 degrees gives your abs a second job: keep your trunk steady while you reach. If that position feels too hard, knee-touch-crunch is usually easier to control.
- Easy to progress without equipment — You can make it harder by slowing each reach, pausing when your fingers touch your heel, or adding reps before switching to a tougher version like lying-toe-touch. That gives you a clear path for progressive overload even with bodyweight only.
- Best for focused ab work — This is an isolation move, so it fits well after heavier lifts when you want direct ab volume without adding much whole-body fatigue. Higher-load and mixed-load training both change how hard muscles work during endurance-style efforts, which backs up using different rep speeds and set lengths to keep this exercise productive over time.
Programming for muscle growth
Do 2-4 sets of 12-25 reps per side, or 30-45 seconds of continuous reps, with 30-60 seconds rest. Train it 2-4 times per week at the end of your workout. Use slow, clean reps and stop 1-2 reps before your form breaks, because the goal is to keep tension on the abs instead of rushing through easy touches.
90 Degree Heel Touch Variations
Alternative Exercises
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FAQ - 90 Degree Heel Touch
The 90 Degree Heel Touch primarily targets the obliques (both internal and external) while also engaging the entire core region including the rectus abdominis. The rotational component activates more muscle fibers than traditional crunches, making it particularly effective for comprehensive core development.
Lie on your back with knees bent at 90 degrees and feet flat on the floor, then elevate your shoulders slightly off the ground while maintaining a neutral spine. Reach with one hand toward the outside of your heel by rotating your torso laterally, then return to center and repeat on the opposite side, keeping your lower back pressed into the floor throughout the movement.
For an easier version, reduce your range of motion by not lifting your shoulders as high off the ground or reaching only partway toward your heel. If you need more support, you can also place your non-working hand behind your head rather than extending it, which provides better stability during the rotational movement.
The most common errors include lifting the feet during the rotation, pulling on the neck with the hands, and using momentum rather than controlled movement. Also avoid excessive lower back arching—your lower back should remain in contact with the floor throughout the exercise to protect your spine and ensure proper oblique engagement.
For strength development, perform 3-4 sets of 10-15 reps per side with controlled movement. For endurance or as part of a HIIT circuit, increase to 20-30 reps per side with minimal rest between sets. Incorporate this exercise 2-3 times weekly, allowing at least 48 hours for your core muscles to recover between sessions.
90 Degree Heel Touch
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