Let’s take it up a notch
20 reps – start light
18 reps – increase weight
16 reps – increase weight
14 reps – increase weight
12 reps – increase weight
10 reps – increase weight
8 reps – should be as heavy as possible now

Note: Rest 2 minutes between sets; finish all 7 sets; it’s time to get out of the comfort zone once more . Increase weight each set by 5-10 pounds but finish as heavy as possible. The last set of 8 should be a challenge to complete with the last 3 reps being a fight to perform. Go heavier than last time you did this, challenge yourself.