Ab Crunch Machine — start position
Start
Ab Crunch Machine — end position
End

Core / Intermediate / Isolation (single joint)

Ab Crunch Machine

A machine isolation exercise for the abs, with the forearms assisting.

At a glance

Primary
Abs
Secondary
Forearms & grip
Equipment
Machines
Movement pattern
Trunk flexion
Level
Intermediate
Type
Core, Isolation (single joint)

How to do it

  1. Select a light resistance and sit down on the ab machine placing your feet under the pads provided and grabbing the top handles. Your arms should be bent at a 90 degree angle as you rest the triceps on the pads provided. This will be your starting position.
  2. At the same time, begin to lift the legs up as you crunch your upper torso. Breathe out as you perform this movement. Tip: Be sure to use a slow and controlled motion. Concentrate on using your abs to move the weight while relaxing your legs and feet.
  3. After a second pause, slowly return to the starting position as you breathe in.
  4. Repeat the movement for the prescribed amount of repetitions.

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Muscles worked

Neck (Front)Upper traps (Front)Front delts (Front)Side delts (Front)Chest (Front)Serratus anterior (Front)Biceps (Front)Forearms & grip — secondary (Front)Abs — primary (Front)Obliques (Front)Hip flexors (Front)Quads (Front)Adductors (Front)Shins (tibialis) (Front)Calves (Front)Outer shins (peroneals) (Front)Feet (arch & toes) (Front)Neck (Back)Upper traps (Back)Upper back (rhomboids, mid/lower traps) (Back)Rear delts (Back)Side delts (Back)Rotator cuff (Back)Lats (Back)Lower back (erectors) (Back)Triceps (Back)Forearms & grip — secondary (Back)Hip abductors (glute med) (Back)Glutes (Back)Hamstrings (Back)Adductors (Back)Calves (Back)
FrontBack
  • Primary: Abs
  • Secondary: Forearms & grip

Best for

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Photos and instructions: free-exercise-db (github.com/yuhonas/free-exercise-db), public domain.