How to Do Dumbbell Single Arm Starfish Crunch

Dumbbell Single Arm Starfish Crunch is a core exercise using dumbbell, listed as intermediate in the A90 Training Club catalogue.

Primary muscle

Core

Equipment

Dumbbell

Difficulty

Intermediate

01 / Move with control

How to perform

How to do Dumbbell Single Arm Starfish Crunch

  1. 01Lie on your back with arms and legs spread wide in a starfish position holding a dumbbell in one hand.
  2. 02Keep the arm with the dumbbell extended straight above your shoulder.
  3. 03Exhale and lift your torso and the opposite leg simultaneously while reaching the dumbbell toward your foot.
  4. 04Rotate your ribcage as you rise to maximize oblique engagement at the top of the crunch.
  5. 05Slowly lower your torso and leg back to the floor with control before starting the next rep.

Same guidance shown inside the A90 app

02 / Anatomy

Muscles worked by Dumbbell Single Arm Starfish Crunch

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

Focus on the rotation of the torso to bring your shoulder toward the opposite knee rather than just moving your arm.

Same coaching engine used inside the A90 app

05 / FAQ

Dumbbell Single Arm Starfish Crunch questions

What muscles does Dumbbell Single Arm Starfish Crunch work?

Dumbbell Single Arm Starfish Crunch is catalogued as a core exercise in A90 Training Club, with the core as its primary muscle group.

How do you do Dumbbell Single Arm Starfish Crunch correctly?

Lie on your back with arms and legs spread wide in a starfish position holding a dumbbell in one hand. Keep the arm with the dumbbell extended straight above your shoulder. Exhale and lift your torso and the opposite leg simultaneously while reaching the dumbbell toward your foot. Rotate your ribcage as you rise to maximize oblique engagement at the top of the crunch. Slowly lower your torso and leg back to the floor with control before starting the next rep.

What is the A90 coach tip for Dumbbell Single Arm Starfish Crunch?

Focus on the rotation of the torso to bring your shoulder toward the opposite knee rather than just moving your arm.

Is Dumbbell Single Arm Starfish Crunch suitable for beginners?

Dumbbell Single Arm Starfish Crunch is rated intermediate in the A90 Training Club catalogue.

What equipment do you need for Dumbbell Single Arm Starfish Crunch?

Dumbbell Single Arm Starfish Crunch uses dumbbell.

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