Performing the: A Step-by-Step Tutorial Seated Alternate Crunch
Engage your core and lift your right knee towards your chest while simultaneously turning your upper body to the right, so your left elbow comes towards your right knee.
Return to the starting position and repeat the movement on the other side, lifting your left knee towards your chest and turning your upper body to the left.
Make sure to keep your back straight and your core engaged throughout the exercise.
Repeat this alternating motion for your desired number of repetitions.