My favorite running coach, Jim Bowles, told me once if he told me a thousand times: "Run THROUGH the finish line, not to it."
My husband's favorite golf coaches tell him: "Swing several inches PAST the ball, or your swing will decelerate at the ball."
Your instincts, oh you novice exercisers, and yes you too, seasoned movers and shakers, seem to be telling you to flop to your knees/your hands/your behind/your tried and true slouch, just as you are approaching the halfway point of your last repetition.
Please, don't slouch halfway. See it through. Finish what you started with all the great technique and oomph and breath and determination you can muster!
Shall I go on at length about the neuromuscular sequencing, motor learning, and proprioception benefits to a strong finish? No, I shant. Are you more likely to take it from me given my use of those five dollar words? You probably shouldn't but I'm kind of hoping so....
Let's insert a slight re-framing. A strong finish is good for your self esteem. Do your very best, with a significant -- even uncomfortable but not painful -- effort, and you will feel better about your movement and more confident in your ability to repeat your fine performance in the future. You will also feel confident transferring your stick-to-it-ive-ness to other demanding tasks.
Follow through. Go beyond. That's the spirit!
May blessings surround you at the holiday season and then some -- Be Well!