Today will cover the Diagonals,
The difference between the normal situp/crunch is
The normal sit up involves just lifting your shoulder blades off the floor,
The diagonals starts of the same as the basic
Lying flat on your back,with knees bent and your right heel, resting on your left knee.
Your left arm is extended out to your side, with the left palm at the back of your head and your elbows sticking out.
Start off the same as a normal situp and right at the top of your situp, twist your torso, so that your left elbow is close to your right knee and vice verse when doing the other side.