How to Do Crunch (Straight Leg Up)

Crunch (Straight Leg Up) is a core exercise using bodyweight, listed as beginner in the A90 Training Club catalogue.

Primary muscle

Core

Equipment

Bodyweight

Difficulty

Beginner

01 / Move with control

How to perform

How to do Crunch (Straight Leg Up)

  1. 01Lie flat on the back and extend the legs toward the ceiling at a ninety degree angle to the hips.
  2. 02Reach the fingertips toward the toes by contracting the abdominals and lifting the shoulder blades off the floor.
  3. 03Exhale at the peak of the contraction, feeling the ribs pull down toward the pelvis.
  4. 04Inhale as the upper back returns to the mat without letting the head rest completely.

Same guidance shown inside the A90 app

02 / Anatomy

Muscles worked by Crunch (Straight Leg Up)

Primary Stabiliser Inactive

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Primary movers

  • Core Stabilises the spine and transfers force.

Stabilisers

  • Lower back Stabilises the spine during lifts and bends.
  • Forearms Grips and stabilises the wrist under load.

03 / A90 Coach

A90 Coach tip

If the lower back lifts off the floor, keep the shoulder blades slightly elevated to maintain constant tension on the rectus abdominis.

Same coaching engine used inside the A90 app

05 / FAQ

Crunch (Straight Leg Up) questions

What muscles does Crunch (Straight Leg Up) work?

Crunch (Straight Leg Up) is catalogued as a core exercise in A90 Training Club, with the core as its primary muscle group.

How do you do Crunch (Straight Leg Up) correctly?

Lie flat on the back and extend the legs toward the ceiling at a ninety degree angle to the hips. Reach the fingertips toward the toes by contracting the abdominals and lifting the shoulder blades off the floor. Exhale at the peak of the contraction, feeling the ribs pull down toward the pelvis. Inhale as the upper back returns to the mat without letting the head rest completely.

What is the A90 coach tip for Crunch (Straight Leg Up)?

If the lower back lifts off the floor, keep the shoulder blades slightly elevated to maintain constant tension on the rectus abdominis.

Is Crunch (Straight Leg Up) suitable for beginners?

Crunch (Straight Leg Up) is rated beginner in the A90 Training Club catalogue.

Do you need equipment for Crunch (Straight Leg Up)?

No. Crunch (Straight Leg Up) is listed as a bodyweight movement in the A90 catalogue, so you can train it with no kit.

A90 Intelligence

Put this into a real plan.

A90 Intelligence programmes crunch (straight leg up) into a 30, 60 or 90 day plan built around your equipment, then adjusts it as you train.

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