Twisting crunches
Start with lying on your back with your knees at a ninety degree angle and your hands by your side or behind your head for support. Now slowly lift your torso in a diagonal fashion (bring a shoulder towards the opposite knee). Keep your head and spine straightly aligned. Slowly return to the starting position without releasing tension on your abdominals. Repeat on other side.
Crunches
Crunches are taught many different ways, but there is a consistant element. Start with lying on your back with your knees at a ninety degree angle and your hands by your side or behind your head for support. Now slowly lift your torso using your abdominals while keeping your head and spine straightly aligned. Slowly return to the starting position without releasing tension on your abdominals.
Weighted Cable Ball Crunch
Start by leaning backward on the ball and grabbing a cable. Now with your body firmly planted on the ground for support, raise the weight and complete a crunch (as shown). Breathe out on the hard part of the crunch and breathe in on the easy part.
Ball Crunches
Lie back on a big ball with your shoulder blades on the ball, with your hips level with the ball slowly roll up contracting your abs (as shown). Slowly return to the starting position
Bridge
Start with your body raised off the ground clenching your abdominals. Now hold your body in this position for 30-60 seconds. This is usually a sports specific exercise used where your abdominals are clenched for a long period of time.