Weight training is a fascinating science. Basically, you do a minute or two of work for no reason other than to tire out your muscle so that the last few seconds of work will cause that muscle to grow. Like most people, all day long, every day, you use your muscles. But they don’t grow. You don’t look like Mr. Universe because you quit using your muscles before you reach the moment where the stress causes them to start growing. It’s the natural thing to do, because an exhausted muscle feels unsafe—and it hurts.
Push until failure
