Abdominal Plyometrics
The use of a medicine ball will aid to increase the level of difficulty of most abdominal or muscular exercises, and is excellent for sports specific preparation.
It's essential that you choose the correct sized ball for your own strength and skill level, as the bodies muscles and joints will be placed under a higher degree of strain, especially whilst the ball is being held or caught with your limbs extended.
Aim to begin any of the exercise's with a light medicine ball, or even a soccer / football, mastering the technique required prior to moving on to a heavier ball.
If working up to a sweat, keep a towel near by, to dry both your hands and the ball, beginners should look at a synthetic rubber ball, ideally with a textured surface to aid catching, whilst advanced persons will find a leather ball more technically challenging.
If working with a partner, make sure that there is good communication between you.