After warming up, choose a weight representing about 70% of your 1RM for whatever exercise you’re about to do. That usually equates to a weight you can do around 12 reps with.
Do 3 reps. Rest 15 seconds.
Do 4 reps. Rest 15 seconds.
Do 5 reps. Rest 15 seconds.
Do 6 reps. Rest 15 seconds.
Do 7 reps. Rest 150 seconds (two and a half minutes).