Dumbbell Seated Tuck Crunch on Floor
- Target muscle
- —
- Equipment
- Dumbbell
- Body part
- Waist
- Type
- Strength
The dumbbell seated tuck crunch on the floor is a weighted core exercise that targets the abdominals (rectus abdominis), with the hip flexors assisting. Seated on the floor holding a dumbbell at your chest, you lean your torso back and tuck your knees toward you in unison, training the front of your core through a full crunching range while adding load for extra resistance.
How to do the Dumbbell Seated Tuck Crunch on Floor
- 1Sit on the floor with your knees bent and feet lifted slightly off the ground, balancing on your sit bones.
- 2Hold a single dumbbell against your chest with both hands, keeping your elbows tucked in and your back straight.
- 3Brace your core and lean your torso back toward a 45° angle while extending your legs out in front of you.
- 4Pause briefly at the bottom, keeping tension on your abs without letting your lower back round onto the floor.
- 5Crunch your torso up and pull your knees in toward your chest at the same time, squeezing your abdominals hard.
- 6Exhale as you tuck and meet in the middle, holding the contracted position for a moment.
- 7Lower back under control to the extended position to begin the next rep.
- 8Finish your reps, then set the dumbbell down safely beside you.
Form tips
- Move slowly and under control in both directions — the lowering (extending) phase builds as much strength as the crunch.
- Keep the dumbbell pinned to your chest so the load stays over your center and doesn't pull you off balance.
- Exhale forcefully as you crunch up to help fully contract the abs and keep your core braced.
- Start with a light dumbbell and add weight only once you can keep your spine and tempo controlled for every rep.
Common mistakes
- Using momentum to swing the torso and knees together, which shifts work off the abs and reduces the training stimulus.
- Rounding the lower back flat onto the floor at the bottom, which releases core tension and can strain the lumbar spine.
- Pulling on the dumbbell or hunching the shoulders forward, which loads the neck and upper back instead of the abdominals.
- Going too heavy too soon, which forces jerky reps and lets the hip flexors take over from the abs.
Frequently asked questions
What muscles does the dumbbell seated tuck crunch on the floor work?
It primarily works the abdominals (rectus abdominis), with the hip flexors assisting as you tuck your knees toward your chest. The whole core stays braced to control the movement.
Is the dumbbell seated tuck crunch good for beginners?
Yes. Beginners can start without any weight to learn the tuck-and-crunch pattern, then add a light dumbbell once they can keep their torso and tempo controlled.
How many sets and reps should I do?
For a core exercise like this, 3 sets of 12–20 controlled reps works well. Keep the dumbbell light enough that your abs — not momentum — drive every rep.
What's a good alternative to this exercise?
A bodyweight tuck crunch, a weighted seated knee-up, or a standard floor crunch holding a dumbbell on your chest all train the abs in a similar pattern.
Where should I feel this exercise?
You should feel it in the front of your core — the abdominals — especially as you crunch up and tuck your knees in. If you mostly feel it in your hip flexors or lower back, slow down and reduce the weight.
