Crunch (arms straight)

Strengthen your rectus abdominis with the Crunch (arms straight). Lie on your back, extend arms overhead, and lift your upper body, engaging your core for

IntermediateWaist Body weight

Movement: Isolation
Force: Pull
Per set: 30s
Rest: 1 min

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Variations of Crunch (arms straight)

Compound

Twisting Crunch (Straight Arms)

Waist · Obliques · Body weight

Intermediate

Isolation

Lying Crunch (straight legs)

Waist · Body weight

Intermediate

Compound

Oblique Crunches with Straight Leg Lift

Waist · Adductor Brevis · Body weight

Intermediate

Isolation

Dumbbell Straight Arm Crunch

Waist · Rectus Abdominis · Dumbbell

Intermediate

Description

A core abdominal strengthening exercise where the individual lies flat on their back, extends arms straight and lifts their upper body towards the ceiling using the abdominal muscles.

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How to do Crunch (arms straight)

01
Setup
Lie on your back with your knees bent, feet flat on the floor, and hip-width apart. Ensure your lower back is pressed gently into the floor.
02
Setup
Extend your arms straight up towards the ceiling, keeping them parallel to each other and your palms facing forward or inwards.
03
Exhale as you slowly engage your abdominal muscles, lifting your head, shoulders, and upper back off the floor. Keep your arms extended towards the ceiling throughout the movement.
04
Focus on drawing your navel towards your spine, crunching your rib cage towards your hips without pulling with your neck. Lift only until your shoulder blades clear the floor.
05
Hold the contracted position briefly at the top, then slowly and with control, inhale as you lower your upper body back to the starting position.

Tips

Maintain a consistent gaze towards the ceiling to help keep your neck in a neutral position, preventing strain.
Focus on the mind-muscle connection, actively squeezing your rectus abdominis at the top of the crunch rather than just going through the motions.
Control the eccentric (lowering) phase of the movement, resisting gravity to maximize muscle engagement and build strength.
Keep your arms locked straight and fixed throughout the movement; avoid swinging them or letting them bend to maintain tension on your core.

Common mistakes

Pulling on your neck instead of engaging your abs strains the cervical spine; fix this by keeping your chin slightly tucked and imagining an apple between your chin and chest.
Using momentum to lift your body reduces abdominal activation; fix this by performing the crunch slowly and with deliberate muscle control.
Lifting too high, turning it into a partial sit-up, takes tension off the rectus abdominis; fix this by only lifting until your shoulder blades are just off the floor.

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Questions

What muscles does Crunch (arms straight) work?

Crunch (arms straight) primarily targets Rectus Abdominis. Secondary muscles include Obliques.

Is Crunch (arms straight) good for beginners?

Crunch (arms straight) is rated intermediate. Beginners can still attempt it with lighter weight and careful form, but it's best to master easier variations first.

What equipment do I need for Crunch (arms straight)?

You need Body weight to perform Crunch (arms straight). If you don't have this equipment, look for variations that target the same muscles with what you have available.

What are the best tips for Crunch (arms straight)?

Maintain a consistent gaze towards the ceiling to help keep your neck in a neutral position, preventing strain. Focus on the mind-muscle connection, actively squeezing your rectus abdominis at the top of the crunch rather than just going through the motions. Control the eccentric (lowering) phase of the movement, resisting gravity to maximize muscle engagement and build strength. Keep your arms locked straight and fixed throughout the movement; avoid swinging them or letting them bend to maintain tension on your core.

What are common mistakes when doing Crunch (arms straight)?

Pulling on your neck instead of engaging your abs strains the cervical spine; fix this by keeping your chin slightly tucked and imagining an apple between your chin and chest. Using momentum to lift your body reduces abdominal activation; fix this by performing the crunch slowly and with deliberate muscle control. Lifting too high, turning it into a partial sit-up, takes tension off the rectus abdominis; fix this by only lifting until your shoulder blades are just off the floor.