Ball Knee Crunches

How to do the Ball Knee Crunches

Start with your body cradled over the ball and then roll your body out with your hands. Have your knees (or feet to make it harder) on the ball. Now bring the ball in using your abdominals and hip flexors. Extend the ball back to the starting position as shown.

These are the muscles , equipment and categories of this exercise.

  • PRIMARY: Lower Abdominal
  • Abdominal
  • Belly
  • Stomach
  • Hip Flexors
  • Isolation

Averages for MyFit Users

The table below represents data from over 200,000 exercise logs and gives us an average for this exercise.

Average Weight LiftedAverage Reps One Rep Max Average
26 lbs15.7 43.1 lbs


What is a good starting weight?


Based on an average weight lifted of 26 lbs for all MyFit users we suggest you start at 50% of that weight:

Try 13 lbs and aim for 12-15 reps.




Alternatives