Our goal at Peak Performance Training, INC. is to help everyone become more effective and efficient in their workouts. Injury prevention is at the top of our list, and that starts with avoiding movements that are proven to cause problems. The crunch and sit-up are at the top of this list! The main objective of our trunk is to resist rotation, not repeatedly go into flexion and extension (especially with an added load)! Remember that if you’re unhappy with the look of your “abs” it probably has close to no connection to your “ab training”, but more to do with your diet and intensity of exercise. So, achieve optimal trunk/spine stability, and as a result injuries will be reduced and results will improve!!!