This sounds insane to me now, but I used to do 500 sit-ups per day. Then I heard that sit-ups were bad for your back. That made sense since my back was starting to kill me. I was only in my early twenties so I figured I had to be doing something wrong. So I switched to crunches. And did 500 of those per day. Guess how my abs looked from all those sit-ups and crunches? I couldn’t tell you. Because I couldn’t see them. There was just a smooth,… continue reading.