Exercise Guide

Jackknife On Exercise Ball

Rectus Abdominis
Lower Back, Obliques, Quadriceps
rating: Ø 3.75 through 4 votes
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required:Exercise Ball
Variations available (23)
Starting PositionExecution

General And Specifics

  • this ab exercise strengthens the core and the hip flexor

Starting Position

  • support yourself with stretched arms and bring the shins on the gym ball
  • the hands are under the shoulders, the legs are stretched out
  • your whole body is in a straight line

Correct Execution

  • brace the abs
  • bend the legs and guide the thighs forward until they are vertical to the ground
  • the gym ball moves towards the hips and is arranged under the feet in the final position
  • hold the position for a bit
  • stretch out your legs then and roll the ball back into the starting position again
  • the upper body is stable during this exercise
  • repeat this stability ball exercise several times
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Related exercise lists:

Strength Training With Exercise Ball, Exercise Ball, Rectus Abdominis, Core, Abs, Strength