Negative Crunch
- Target muscle
- Rectus Abdominis
- Synergist muscles
- Obliques
- Equipment
- Body weight
- Body part
- Waist
- Type
- Strength
The negative crunch is an eccentric-focused abdominal exercise that targets the rectus abdominis by starting in the contracted position and slowly lowering your torso toward the floor, with the obliques assisting throughout the movement. Emphasizing the lowering phase increases time under tension compared to a standard crunch, making it a useful tool for building core strength and muscular control.
How to do the Negative Crunch
- 1Lie on the floor with your knees bent at roughly 90° and your feet flat on the ground, hip-width apart.
- 2Cross your arms over your chest or place your fingertips lightly behind your ears without pulling on your neck.
- 3Curl your torso up into the fully contracted crunch position — shoulder blades off the floor, lower back pressed down — before starting the working rep.
- 4Brace your core and begin lowering your torso toward the floor in a slow, controlled arc.
- 5Take 3–5 seconds to lower yourself, maintaining tension in your abs throughout the descent.
- 6Stop just before your shoulder blades touch the floor to keep tension on the rectus abdominis, or lower fully for a brief pause.
- 7Contract your abs to curl back up to the starting position, then repeat for the desired number of reps.
Form tips
- Focus on controlling the tempo on the way down — if you drop quickly, you lose the eccentric benefit the exercise is designed for.
- Keep your lower back flat against the floor during the lowering phase to avoid lumbar strain.
- Exhale as you curl up to the starting position and inhale slowly as you lower down.
- Keep your chin slightly tucked, as if holding a tennis ball under it, to avoid straining your neck.
Common mistakes
- Lowering too fast and losing control of the descent, which eliminates the time-under-tension stimulus that makes this variation effective.
- Pulling on the back of the head during the movement, which shifts strain onto the neck instead of loading the abdominals.
- Letting the lower back arch off the floor as you lower down, which reduces core engagement and can cause lumbar discomfort.
- Only performing half of the range of motion, cutting the lowering phase short and reducing the total work done by the rectus abdominis.
- Holding your breath during the set, which raises intra-abdominal pressure and causes unnecessary tension elsewhere in the body.
Frequently asked questions
What is a negative crunch?
A negative crunch is the eccentric phase of a standard crunch performed in isolation — you start in the contracted position and slowly lower your torso toward the floor, placing the focus on the lowering portion of the movement to increase time under tension on the rectus abdominis.
What muscles does the negative crunch work?
It primarily works the rectus abdominis (the muscle that runs vertically along the front of your abdomen), with the obliques acting as synergists to stabilize the torso during the controlled descent.
How slow should the lowering phase be?
Aim for 3–5 seconds on the way down. Going slower increases the eccentric demand on the rectus abdominis, which can promote greater strength gains and muscular control over time.
Is the negative crunch better than a regular crunch?
Neither is strictly better — they train the same muscle but in different ways. The negative crunch emphasizes the eccentric phase and increases time under tension, making it a useful complement to standard crunches rather than a direct replacement.
How many reps should I do for negative crunches?
Because the slow tempo makes each rep more demanding, sets of 8–15 reps are common. Focus on maintaining control throughout every rep rather than chasing a high number.
