Everlast AB Tightener II
More effective than traditional crunches with three adjustable tension levels and impact free motion.  Develop defined abs, a sculpted waist and chiseled chest in just minutes a day.  Lateral pivot lets you move from a full crunch to an oblique crunch in one easy motion.  Alleviates back strain and knee injury. 

• Excellent for any fitness level

• Prevents back strain common with floor crunches

• More effective than traditional crunches

• Three tension levels adjust with turn of collar

• Exercise and Fitness Guide included