I am committed to finishing my exercises.

Finishing is a different skill from starting, and it lives in the last three repetitions.

Nobody watches the final set. There's no one else in the room, nothing is being recorded, and stopping two short would cost you nothing you could ever measure.

Do them anyway and something accumulates that has little to do with muscle. You become a person who doesn't quietly renegotiate the terms when no one is checking. That particular habit transfers to nearly everything else you'll ever attempt, which is why the last three matter more than the first thirty.