Tuck-Up — how to, muscles worked, alternatives

How to do the Tuck-Up

Lie flat, legs straight, arms overhead.
Curl up and pull your knees toward your chest together.
Wrap your arms over your knees and pause briefly.
Lower back down slowly, arms overhead and legs straight.

Full technique — 6 steps

Lie on your back with legs straight and together and arms extended overhead on the floor.
Press your lower back into the floor and tighten your stomach.
Curl your upper body up while bending your knees and pulling them toward your chest.
Bring your arms forward and wrap them over your knees as you balance on your hips.
Pause briefly in this position, then lower your torso and straighten your legs under control.
Return your arms overhead and reset flat before the next rep.

Common mistakes

Swinging arms for momentum
Dropping back onto the floor
Lower back arching off floor
Lifting the torso without the knees
Rolling back too far off balance

Form cues

Curl ribs toward pelvis
Torso and knees meet
Curl, don't yank up
Exhale on the curl

Substitutes by equipment

Same muscles, same movement — pick the version you have the gear for.

Where to start and where to go next

Same muscles, same movement. Too hard for now — step down; once it gets easy — step up.

Easier Reverse Crunch 25% of bodyweight
Easier Ab Wheel Pass Crunch 30% of bodyweight
This exercise Tuck-Up 35% of bodyweight
Harder Ab Wheel Half Rollout 40% of bodyweight
Harder Ab Wheel Knee Tuck 60% of bodyweight

Too hard for now? Start with the Ab Wheel Pass Crunch.

Quick answers

What muscles does the Tuck-Up work?

Primary: Abs 9/10. Also works: Obliques 5/10.

When should I do the Tuck-Up in a workout?

Finisher. Goes last, once the heavy work is done. ≈ 5 min with rest.

How many sets and reps of the Tuck-Up?

Strength: 3–4 sets of 8–12 reps, rest 1 min 15 s, 2–3 reps in reserve. Muscle growth: 3–4 sets of 10–15 reps, rest 1 min, 2–3 reps in reserve. Endurance: 2–3 sets of 15–25 reps, rest 45 s, 3–4 reps in reserve.

What can I do instead of the Tuck-Up?

Dumbbells: Dumbbell Decline Sit-Up, Dumbbell Straight Arm Crunch. Resistance bands: Lying Resistance Band Crunch, Lying Resistance Band Knee Tuck. Medicine ball: Medicine Ball Toe Touch Crunch, Medicine Ball Straight Arm Crunch. Suspension trainer: Suspension Trainer Hanging Knee Raise, Suspension Trainer Hanging Leg Raise.