Circuit Design

Starting off with circuits is quite easy. Do an exercise for about 10 repetitions, then move on to the next one. Beginners can rest between each exercise and then each set.
To make the circuit harder, do more sets round or reduce the amount of rest between sets and then exercises.
Harder still is to do all the reps of an exercise before moving to the next. So instead of doing 5 sets of 10, do 1 set of 50. Good fun until you get to the burpees, tuck jumps and pull ups.
This reduces the overall time of your workout, so what can take some people 20 minutes, you can get done in 7-8 minutes.