5 steps and you shall be able to perform chair leg-in/ knee-up exercise.
Be seated at the end of a chair. Let your legs be stretched straight and angled slightly towards the ground.
Hold the chair from the sides for stability.
Starting position: Incline to an almost 45 degrees angle towards the chair.
Final position: Pull up your knees towards yourself and push your upper body towards the knees. Exhale your breath while you're performing this movement.
Straighten your legs again and move back to the initial/starting position. Inhale your breath while you complete this part. Pause for a while and then continue with the remaining reps.