9. Side crunches with a balance ball

Lateral crunches with a balance ball are very effective for the outer and inner obliques, as the instability of the ball forces you to activate these muscles to the maximum.

  • Lie sideways with your right hip on a gymnastics ball.
  • Put the left foot behind the right foot, use a wall if you need additional support.
  • Place your hands on the back of your head for support, but try not to pull during exercise.
  • Crunch upwards while lifting the upper body.
  • Slowly return to the starting position.
  • Repeat the exercise 10-12 times.
  • Change sides and repeat the exercise 10-12 times on the other side.

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