Incline sit ups

Starting position: Lie on the bench and place your feet under the pads to secure your legs. Place your hands behind your head. 

Form: Exhale and curl your body forward to the sit up position. Hold briefly at the top and then slowly return to the starting position. 

Perform 8-50 repetitions. 

Personal Training Tips 
This is an advanced ab exercise because it places a large amount of pressure on the lower back, and many trainers will say never perform sit ups with the feet anchored. 

Every exercise has benefits and risks. If you are a serious athlete doing highly vigorous and competitive sports the benefit of incline sit ups may outweigh the risk of injury. 

However, if you have a lower back injury and are not competing in serious athletics, incline sit ups might have a higher risk of injury than benefit gain.