for example i do 3x10 sets of db incline press and on last set i want to get this 10 reps no matter how hard i try. so i did 8 reps really struggling with 8th rep and then i pause for 5-6 seconds and try get 9th rep (of course with a spotter). Then if i succeed i also pause for this 5-6 seconds and try to get that last 10th rep. If i fail , thats fine, i will progress next week.