Tuck Crunch
Quick answer
The tuck crunch is an ab exercise where you lie on your back with your hips and knees bent and feet lifted, then curl your head and shoulders off the floor toward your knees. It mainly works the rectus abdominis, the muscle at the front of your abs.
Written by the GymStreak coaching team · Updated
Muscles worked
Primary
How to do Tuck Crunch
- 1
Lie on the floor with knees bent and hands lightly behind your neck. Raise you feet off the ground and have them in a 90 degree position. This is your starting position.
- 2
Begin by rolling your shoulders off the ground, pushing your lower back into the ground to isolate your abdominal muscles.
- 3
Lift your shoulders as far as you can without lifting your lower back off the ground.
- 4
Pause the contraction for a moment at this point then slowly return to the starting position.
Form cues
- Keep your lower back gently pressed into the floor throughout.
- Curl up by bringing your ribs toward your hips, not your chin to your chest.
- Rest your fingertips lightly behind your head; never pull on your neck.
- Keep your elbows wide and your legs still in the tucked position.
- Pause at the top, then lower your shoulders slowly.
Breathing: Breathe out as you curl your shoulders up; breathe in as you lower back to the floor.
Common Tuck Crunch mistakes
Yanking the head forward with the hands
Let your hands just support the weight of your head and keep a fist-sized gap between chin and chest.
Legs drifting down toward the floor
Hold your knees over your hips so your lower back stays flat.
Swinging up with momentum
Pause for a moment at the bottom and curl up slowly from there.
Trying to sit all the way up
Keep the range short: curl until your shoulder blades clear the floor while your lower back stays down.
Sets and reps by goal
| Goal | Sets | Reps | Rest |
|---|---|---|---|
| Beginners | 1–3 | 10–15 | 60–90 s |
| Muscular endurance | 2–3 | 12–20 | 30–60 s |
Starting ranges in line with the ACSM guidance on resistance training. Pick a load you can lift with good form for every rep, and add weight or reps gradually.
Tuck Crunch variations and alternatives
Variations
- Crunch
The easier version with your feet on the floor if holding your legs up is hard.
- Weighted crunch
Holding a dumbbell on your chest adds resistance once bodyweight reps are easy.
- Cocoons
Bring your arms and knees together from an extended position for a harder, more dynamic version.
Alternatives
- Reverse crunch
Curls your pelvis toward your ribs instead, so your hips do the moving.
- Dead bug
A slower drill that teaches you to keep your lower back down while your limbs move.
- Cable crunch
Lets you add load in small steps once you need more resistance.
Tuck Crunch FAQ
What's the difference between a tuck crunch and a regular crunch?
In a regular crunch your feet stay on the floor. In a tuck crunch you lift your feet so your hips and knees are bent at about 90 degrees, which stops you from pushing through your feet and makes it easier to keep your lower back flat. The upper-body curl is the same in both.
Is the tuck crunch good for beginners?
Yes. It's a low-impact floor exercise with a short range of motion. If holding your legs up is tiring, rest your calves on a bench or chair seat, or start with regular crunches. Focus on slow, controlled reps and a relaxed neck rather than a high rep count.
Why does my neck hurt during tuck crunches?
Neck strain usually comes from pulling your head forward with your hands or leading with your chin. Rest your fingertips behind your ears, keep your elbows out and imagine holding a small ball between your chin and chest. You can also cross your arms over your chest instead. If the pain continues, stop and get it checked by a qualified professional.
Do tuck crunches burn belly fat?
No exercise burns fat from one specific area. Tuck crunches strengthen your abs, but whether those muscles are visible depends mainly on your overall body fat, which is driven by your diet, activity level and consistency over time. Use crunches to build the muscle and manage body fat through your overall habits.
Sources
Related calculators
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