# Dumbbell Straight Arm Crunch

A floor crunch holding one dumbbell in straight arms above your chest, pushing it toward the ceiling as your upper back lifts. Adds load to the crunch to train the abs.

- Beginner · Isolation
- Equipment: Dumbbells
- HD video: https://media.seto.fit/exercises/dumbbell-straight-arm-crunch/video/male.mp4
- HTML: https://seto.fit/exercises/dumbbell-straight-arm-crunch/

## Muscles worked

- Abs: 9/10
- Obliques: 5/10

## How to do the Dumbbell Straight Arm Crunch

1. Lie on your back, knees bent, holding one dumbbell above your chest.
2. Curl your head and shoulders up, pushing the dumbbell toward the ceiling.
3. Keep your arms straight and your lower back on the floor.
4. Slowly lower back down until your upper back touches the floor again.

### Full technique — 7 steps

1. Lie on your back with knees bent and feet flat on the floor.
2. Hold one dumbbell upright with both hands, arms straight above your chest.
3. Press your lower back into the floor and keep your ribs pulled down.
4. Curl your head, shoulders, and upper back off the floor by shortening your abs.
5. Push the dumbbell toward the ceiling as you rise, keeping your arms straight.
6. Lift until your shoulder blades clear the floor without turning it into a sit-up.
7. Lower your upper back down until your shoulder blades return to the floor.

## Common mistakes

- Bending the elbows to move the dumbbell
- Letting the dumbbell drift behind your head
- Turning reps into sit-ups
- Lower back arching off floor
- Swinging up with momentum

## Form cues

- Keep arms straight
- Reach toward the ceiling
- Keep low back down
- Lift shoulder blades only
- Exhale into the crunch

## How much to do

- **Strength**: 3–4 sets of 8–10 reps · rest 1 min 30 s · 2 reps in reserve · lower 2 s, pause 1 s, lift 1 s
- **Muscle growth** (good fit): 3–4 sets of 10–15 reps · rest 1 min · 2–3 reps in reserve · lower 2 s, pause 1 s, lift 2 s
- **Endurance** (good fit): 2–3 sets of 20–25 reps · rest 45 s · 3–4 reps in reserve · lower 2 s, lift 1 s

Reps in reserve: how many more you could still do when you end the set.

## Substitutes by equipment

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

- **No equipment**: [Ab Wheel Straight Arm Crunch](https://seto.fit/exercises/ab-wheel-straight-arm-crunch/), [Alternating Tuck-Up](https://seto.fit/exercises/alternating-tuck-up/)
- **Resistance bands**: [Lying Resistance Band Crunch](https://seto.fit/exercises/lying-resistance-band-crunch/), [Lying Resistance Band Knee Tuck](https://seto.fit/exercises/lying-resistance-band-knee-tuck/)
- **Medicine ball**: [Medicine Ball Toe Touch Crunch](https://seto.fit/exercises/medicine-ball-toe-touch-crunch/), [Medicine Ball Straight Arm Crunch](https://seto.fit/exercises/medicine-ball-straight-arm-crunch/)
- **Suspension trainer**: [Suspension Trainer Hanging Knee Raise](https://seto.fit/exercises/suspension-trainer-hanging-knee-raise/), [Suspension Trainer Hanging Leg Raise](https://seto.fit/exercises/suspension-trainer-hanging-leg-raise/)

## Where to start and where to go next

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

- **This exercise: Dumbbell Straight Arm Crunch — Beginner**
- Harder: [Dumbbell Toe Touch Crunch](https://seto.fit/exercises/dumbbell-toe-touch-crunch/) — Beginner
- Harder: [Dumbbell Decline Sit-Up](https://seto.fit/exercises/dumbbell-decline-sit-up/) — 40% of bodyweight

## Quick answers

### What muscles does the Dumbbell Straight Arm Crunch work?

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

### When should I do the Dumbbell Straight Arm Crunch in a workout?

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

### How many sets and reps of the Dumbbell Straight Arm Crunch?

Strength: 3–4 sets of 8–10 reps, rest 1 min 30 s, 2 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 20–25 reps, rest 45 s, 3–4 reps in reserve.

### What can I do instead of the Dumbbell Straight Arm Crunch?

No equipment: Ab Wheel Straight Arm Crunch, Alternating Tuck-Up. 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.

### What is a harder version of the Dumbbell Straight Arm Crunch?

Dumbbell Toe Touch Crunch (Beginner), Dumbbell Decline Sit-Up (40% of bodyweight).

How we rate exercises: https://seto.fit/guides/methodology/

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