Not all pain is gain. A little story: I once knew a guy who trained martial arts, a lot. He had a proverb he was fond of. He used to say "Pain is just the sens

Not all pain is gain. A little story: I once knew a guy who trained martial arts, a lot. He had a proverb he was fond of. He used to say "Pain is just the sensation of weakness leaving the body". And so he kept on training, even when it really hurt, because he knew it was just weakness leaving his body. And it worked; over a period of twenty years, nearly all the weakness left his body. When I last saw him, there wasn't enough weakness left in his knees or ankles for them to even bend. He walks with a stick, of course. Turns out that you probably ought to leave a bit of weakness in there.