Here is a brilliant superset for abdominal muscles. You need a total gym or an incline sit up board for this. The exercises are incline reverse crunches immediately followed by incline sit-ups (old school sit ups – all the way up). The goal is to do ten reps on each exercise with no rest in-between sets. Aim for three rounds and try to get the maximum number of reps i.e. sixty.
If you can’t reach ten reps on any of the sets just move on to the other exercise and carry on. Add up your score at the end and try to beat it next time.