HOW: Begin laying on your back with your legs straight and holding a kettlebell in one hand with that arm straight. From this position, keep the kettlebell pressed towards the ceiling as you bring your body up to a sitting position. Return to the starting position and repeat for the given number of reps.
FEEL: You will feel your abdominal and shoulder muscles working as you perform this exercise.
COMPENSATION: Do not use your uninvolved arm to press on the ground as you sit up, you want to use your core muscles as much as possible for this movement instead of pushing through your arm.