Failure training has been a bodybuilding staple for decades. Why? Because it works. Just be wise when you use the method and make sure you're recovering optimally.
One way to "finish off" every possible muscle fiber is by using drop sets. Just lift a weight until you can't get another good rep, then drop the weight a couple of more times to extend the set.
While there are no set rules, in the video I'm doing the following:
- 130 pound dumbbells: 10 reps
- 95 pound dumbbells: 8 reps
- 80 pound dumbbells: 5 reps plus a couple of partials
Not locking out completely at the top to keeps the tension on the chest.