90 Degree Alternate Heel Touch

Body Part: Waist

Muscle: Obliques

Equipment: Body Weight

90 Degree Alternate Heel Touch is a bodyweight core exercise that trains the obliques through a short, controlled reach from a tabletop leg position. The movement looks simple, but the quality of each rep depends on keeping the ribs stacked over the pelvis, the neck relaxed, and the trunk from swinging side to side. When done well, it builds useful trunk control that carries over to crunch variations, rotation work, and anti-extension training.

The image shows the athlete lying on the floor with the hips and knees bent to about 90 degrees, shins lifted, shoulders slightly off the ground, and one hand reaching toward the same-side heel before alternating to the other side. That setup matters because it shortens the lever arms and makes the obliques do the work instead of the lower back or hip flexors. If the feet drift too far away or the chest comes too high, the exercise turns into a momentum drill instead of a targeted abdominal contraction.

The best version of this exercise starts with a small curl of the upper torso, not a violent reach. From there, alternate heel touches by drawing the rib cage toward the pelvis and reaching the hand toward the outside of the heel with control. The pelvis should stay mostly quiet while the obliques create the side-to-side compression. A short pause at each touch is enough to make the rep effective without losing tension.

This is a good option for warm-ups, accessory core work, or higher-rep ab circuits when you want an exercise that is low equipment and easy to scale. Beginners can use it as a floor-based entry into core training, while more advanced lifters can make it harder by slowing the tempo, extending the legs slightly, or reducing the rest between reps. The goal is not to touch aggressively or reach farther every rep, but to keep the trunk organized and repeat the same clean pattern.

Safety comes from controlling the neck, lumbar spine, and breathing. Keep the chin lightly tucked, exhale as you reach, and stop the set if the lower back starts arching off the floor or the shoulders begin yanking forward. If you can only keep tension with a smaller range, that is the correct range for the set. Clean alternation with steady abdominal tension is the standard for this movement.

Instructions

• Lie on your back on the floor and lift your legs so your hips and knees are both bent around 90 degrees, with your shins parallel to the floor.
• Reach both arms forward and slightly out to the sides, then lift your shoulders and upper back just off the floor so your ribs stay tucked toward your pelvis.
• Set your neck in a neutral position, keep your chin lightly tucked, and keep your lower back gently pressed toward the floor.
• Exhale and curl your torso slightly as you reach your right hand toward your right heel without pulling your head forward.
• Touch or approach the heel with control, then briefly squeeze your right oblique before returning to the centered hover position.
• Repeat the reach on the left side, keeping your hips quiet and your legs in the same tabletop position.
• Alternate sides in a smooth rhythm, using the abdominal wall to drive the movement instead of swinging the arms or rocking the pelvis.
• Keep each rep short and controlled, then lower your shoulders and legs to the floor only when the set is complete.

Tips & Tricks

• Keep the knees stacked over the hips at roughly 90 degrees; if the legs drift lower, the hip flexors usually take over.
• Make the shoulder lift small. A big crunch reduces the oblique emphasis and often pulls on the neck.
• Reach toward the heel with the hand, but do not yank the shoulder forward to force contact.
• Keep the opposite hand from flaring away from the body; a quiet non-working side helps prevent torso rotation.
• Exhale on each touch so the ribs can drop and the obliques can shorten harder.
• If your lower back arches, bring the legs a little closer to the hips or shorten the reach.
• Move as if each side is its own repetition rather than bouncing rapidly from heel to heel.
• Stop the set when the head starts leading the movement or the pelvis starts rocking side to side.

Frequently Asked Questions

What muscle does 90 Degree Alternate Heel Touch target most?

The obliques are the main target, especially the external obliques on both sides as you alternate reaching across the body.

Can beginners perform this exercise?

Yes. Beginners usually handle it well because it is bodyweight and easy to scale by reducing the shoulder lift or keeping the legs slightly closer to the hips.

How high should I hold my legs during the rep?

Keep the hips and knees close to 90 degrees with the shins roughly parallel to the floor. If the low back arches, raise the legs slightly.

Should my shoulders stay on the floor or hover during the set?

Keep the shoulders and upper back lightly lifted. That small hover is enough to challenge the abs without turning the drill into a full crunch.

What is the biggest form mistake with alternating heel touches?

Most people pull with the neck or swing the torso. The reach should come from the obliques, not from jerking the head and shoulders side to side.

Why do my hip flexors feel this exercise so much?

If the legs drop too low or drift away from the body, the hip flexors take on more of the work. Keep the tabletop shape compact and the pelvis quiet.

Is this exercise good for low-back-sensitive lifters?

It can be, as long as the lower back stays gently pressed down and the range stays small. If you cannot hold that position, shorten the lever or choose an easier core drill.

How can I make 90 Degree Alternate Heel Touch harder?

Slow the alternation, keep the shoulders hovered longer, pause briefly at each heel touch, or extend the legs a little farther while preserving low-back contact.