Single Leg Knee-In

Intermediate Level of Difficulty

The single leg knee-in is an intermediate core exercise. This exercise helps to improve abdominal stength and core stabilization.


Picture of Abdominals


The abdominal muscles (abs) provide movement and support to your core area. The deeper and closer to the spine the particular abdominal muscle is, the more effect over body posture it will have, and this often contributes significantly to a healthy back.

Equipment Used

Picture of Stability Ball

Stability Ball

A stability or exercise ball is a ball constructed of soft elastic and filled with air until firm.Most stability balls range from a diameter of approximately 35 to 85 centimeters (14 to 34 inches).

Exercise Instructions

single leg knee-in - step 1

Step 1

Start in a push-up plank position on the stability ball with one leg raised off of the ground.

single leg knee-in - step 2

Step 2

Push the stability ball out as you extend your raised leg.

single leg knee-in - step 3

Step 3

Pull the stabilty ball back in and meet it with your knee.