Setup

Lie on your back. Bend your knees, feet flat on the floor.

Move your feet close enough that your fingertips almost reach your heels when you stretch your arms down at your sides.

Arms stay straight, palms facing your legs. Lift your head and shoulder blades a little off the floor — and keep them there for the whole set.

Why the setup does the work here

The lift at the start is the whole trick. If your shoulders rest on the floor, your sides switch off and your arm just slides across the mat. Nothing happens.

Lift up first, and your obliques are already working before rep one. Every heel touch after that is added on top of a muscle that's already holding you.

Foot distance sets your range. Too far, and you swing your arm instead of bending. Too close, and there's nothing to reach for.

Technique

Bend your body to one side — like you're closing a book sideways. Reach down and tap your heel with your fingertips.

Come back to the middle, then bend to the other side. That's one rep each way.

The bend comes from your waist, not your arm. Your shoulder should move down toward your hip.

Keep your head off the floor between reps. Don't rest, don't bounce, don't drop back down.

Slow and steady. One side, back, other side.

Why technique decides everything here

Your obliques do one job: they bend you sideways. That's it.

So if your waist doesn't bend, your obliques don't work — no matter how far your hand travels. You can reach any heel by just stretching your arm. That's a shoulder exercise.

Watch your ribs. If the rib on the side you're bending drops toward your hip, you're doing it right. If your ribs stay flat and only your arm moves, you're doing nothing.

Small movement. Real bend. Every rep.

Common Mistakes

Resting your head between reps. The set breaks and your abs let go. Head stays up the whole time.

Reaching with the arm only. Fingers slide, waist stays straight. No bend, no result.

Going too fast. Rocking side to side like a windshield wiper. Speed hides the fact that nothing is bending.

Feet too far away. You end up swinging and straining your neck instead of squeezing your sides.

Where people lose results

This exercise looks easy, so people do it lazy. Fifty fast taps feel like a workout and do almost nothing.

Slow down. Fifteen real bends beat fifty slides.

And remember it's still a muscle. When the reps get easy, don't just add more — hold a light dumbbell in each hand, or pause for one second at each heel. Harder, not longer.

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