Cluster Training is a high amount of sets pushing with an above medium weight at around 7 or 8 reps with 45 seconds rest inbetween sets.
This will rip and bulk the muscle group you are doing it on.
Watch this quick video to see more and if you want to try it then you can download the MP3 via soundcloud to help you out. It is a pain to keep playing with timers while you are pushing weights and this is why I created this Free MP3. It will also keep the tempo of your lifting so it is not too fast or too slow.
Download the free timer. It will come in handy at the gym.
