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Side Stretch Crunch

Performing the: A Step-by-Step Tutorial Side Stretch Crunch

Lean to the right while keeping your torso straight, and then straighten up, lifting your right knee towards your right elbow in a side crunch.
Lower your right foot back to the ground and return to the starting position.
Repeat the same movement on the left side, leaning to the left and then straightening up while lifting your left knee towards your left elbow.
Continue alternating between right and left side for the desired number of repetitions.