# Stability Ball Sit-Up

A full sit-up on a stability ball: lie back over the ball until your head drops below your hips, then sit up until your torso is upright. The ball lets you lower further than on the floor. Trains the abs.

- Beginner · Isolation
- Equipment: Stability ball
- HD video: https://media.seto.fit/exercises/exercise-ball-sit-ups/video/male.mp4
- HTML: https://seto.fit/exercises/stability-ball-sit-up/

## Muscles worked

- Abs: 9/10
- Obliques: 6/10

## How to do the Stability Ball Sit-Up

1. Sit on the ball, feet flat, hands behind your head.
2. Lie back over the ball until your head drops below your hips.
3. Sit up until your torso is upright, feet planted.
4. Lower back down slowly and repeat.

### Full technique — 6 steps

1. Sit on top of a stability ball with feet flat on the floor, about hip-width apart, and knees bent about 90 degrees.
2. Lace your fingers behind your head with elbows out wide.
3. Lower your torso back over the ball under control until your head drops below your hips.
4. Keep your hips on top of the ball and your feet planted in the same spot.
5. Tighten your stomach and sit up until your torso is upright over your hips.
6. Lower yourself back over the ball under control for the next rep.

## Common mistakes

- Pulling the head with hands
- Swinging the torso with momentum
- Dropping back onto the ball
- Letting the ball roll away
- Stopping short of upright

## Form cues

- Hands stay by head
- Lift with abs first
- Keep elbows wide
- Feet stay planted
- Hips stay on the ball

## How much to do

- **Strength**: 3 sets of 8–10 reps · rest 1 min 15 s · 2–3 reps in reserve · lower 2 s, pause 1 s, lift 1 s
- **Muscle growth** (good fit): 3–4 sets of 12–15 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 1 s, lift 2 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.

- **Resistance bands**: [Kneeling Resistance Band Crunch](https://seto.fit/exercises/kneeling-resistance-band-crunch/), [Resistance Band Decline Sit-Up](https://seto.fit/exercises/resistance-band-decline-sit-up/)
- **Suspension trainer**: [Suspension Trainer Hanging Leg Raise](https://seto.fit/exercises/suspension-trainer-hanging-leg-raise/), [Suspension Trainer Hanging Knee Raise](https://seto.fit/exercises/suspension-trainer-hanging-knee-raise/)
- **Dumbbells**: [Dumbbell Decline Sit-Up](https://seto.fit/exercises/dumbbell-decline-sit-up/), [Dumbbell Straight Arm Crunch](https://seto.fit/exercises/dumbbell-straight-arm-crunch/)
- **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/)

## 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: [Ab Wheel Straight Arm Crunch](https://seto.fit/exercises/ab-wheel-straight-arm-crunch/) — 15% of bodyweight
- Easier: [Reverse Crunch](https://seto.fit/exercises/reverse-crunch/) — 25% of bodyweight
- **This exercise: Stability Ball Sit-Up — 30% of bodyweight**
- Harder: [Ab Wheel Half Rollout](https://seto.fit/exercises/ab-wheel-half-rollout/) — 40% of bodyweight
- Harder: [Ab Wheel Knee Tuck](https://seto.fit/exercises/ab-wheel-knee-tuck/) — 60% of bodyweight

## Quick answers

### What muscles does the Stability Ball Sit-Up work?

Primary: Abs 9/10. Also works: Obliques 6/10.

### When should I do the Stability Ball Sit-Up in a workout?

Finisher. Goes last, once the heavy work is done. ≈ 6 min with rest.

### How many sets and reps of the Stability Ball Sit-Up?

Strength: 3 sets of 8–10 reps, rest 1 min 15 s, 2–3 reps in reserve. Muscle growth: 3–4 sets of 12–15 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 Stability Ball Sit-Up?

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

### What is an easier version of the Stability Ball Sit-Up?

Reverse Crunch (25% of bodyweight), Ab Wheel Straight Arm Crunch (15% of bodyweight).

### What is a harder version of the Stability Ball Sit-Up?

Ab Wheel Half Rollout (40% of bodyweight), Ab Wheel Knee Tuck (60% of bodyweight).

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

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