Negative Crunch
- Músculo objetivo
- Rectus Abdominis
- Músculos sinergistas
- Obliques
- Equipamiento
- Body weight
- Parte del cuerpo
- Waist
- Tipo
- Strength
The negative crunch is an eccentric-focused bodyweight ab exercise that trains the rectus abdominis by starting in the fully contracted crunch position and lowering your torso back toward the floor under control, with the obliques stabilizing the trunk throughout. Slowing the descent to 3–5 seconds pushes time under tension well past a standard crunch, making it a practical way to build core strength and control with no equipment.
Cómo hacer el Negative Crunch
- 1Lie on your back with your knees bent to roughly 90° and your feet flat on the floor, hip-width apart.
- 2Cross your arms over your chest, or rest your fingertips lightly behind your ears without gripping your head.
- 3Press your lower back into the floor and curl your torso up until your shoulder blades clear the ground — this contracted position is where every rep starts.
- 4Brace your core, then begin lowering your torso in a slow arc, uncurling your spine one segment at a time.
- 5Take 3–5 seconds to descend, keeping your abs tight and your lower back flat against the floor the whole way.
- 6Stop just before your shoulder blades touch down to hold tension on the rectus abdominis, or set them down briefly if you need to reset between reps.
- 7Curl back up to the fully contracted position at normal speed, then repeat for the desired number of reps.
- 8Finish the set by lowering your torso and head to the floor and relaxing your arms.
Consejos de técnica
- Arm position sets the difficulty: crossed on your chest is the shortest lever, fingertips behind the ears is harder, and arms extended overhead is hardest — progress by lengthening the lever before you add reps.
- Keep your feet flat and unanchored rather than hooking them under a bench or having a partner hold them, so your hips cannot help pull you through the rep.
- Exhale as you curl up and inhale slowly through the descent, using the breath to meter your 3–5 second count.
- Keep your chin lightly tucked, as if holding a tennis ball under it, and let your ribcage lead the movement — the rectus abdominis shortens by flexing your spine, not by moving your head.
Errores comunes
- Dropping through the descent instead of resisting it, which throws away the time-under-tension stimulus that is the entire point of the variation — the rep becomes a negative in name only.
- Pulling on your head with your hands to slow the descent, which loads the neck instead of the abdominals and leaves you sore in the wrong place.
- Letting your lower back arch away from the floor as your torso descends, which hands the work to your hips, drains tension from the rectus abdominis, and can leave your lumbar spine aching.
- Starting each rep from a half-curled position rather than a fully contracted crunch, which quietly shortens every negative and cuts the total work the rectus abdominis does across the set.
- Holding your breath to brace through the descent, which is hard to sustain for 3–5 seconds and usually ends in a rushed rep and a spike in blood pressure.
Preguntas frecuentes
What is a negative crunch?
A negative crunch isolates the eccentric — lowering — half of a standard crunch. You begin in the fully contracted position with your shoulder blades off the floor and take 3–5 seconds to lower your torso back down, so the rectus abdominis does its hardest work while it is lengthening.
What muscles does the negative crunch work?
It targets the rectus abdominis, the muscle running vertically down the front of your abdomen, with the obliques acting as synergists to stabilize your trunk and keep the slow descent square rather than twisting.
How slow should the lowering phase be?
Aim for 3–5 seconds. That is long enough that the rectus abdominis resists the whole descent instead of freefalling through it. Going slower raises the demand further, but only if you can keep your lower back flat the entire way down.
Negative crunch vs. regular crunch — what's the difference?
Both train the rectus abdominis, but a regular crunch emphasizes curling up while a negative crunch emphasizes the controlled lowering. The negative keeps the muscle loaded for longer per rep, so it works best as a complement to standard crunches rather than a replacement.
How many reps should I do for negative crunches?
Sets of 8–15 slow reps suit most people, since a 3–5 second descent makes each rep far more demanding than a standard crunch. End the set once your descent starts speeding up or your lower back lifts — that is the rep where the stimulus disappears.
