I love to work out hard. I run, I sweat, I train, and I like it when I wake up with that "I know I had a good work" feeling. Sore and stiff muscles heal and become stronger, but sore and inflamed joints don't. I know the difference. I don't bang poles or kick 2x4s because I have to work for a living. I tend to think of "no pain no gain" more as a mental philosophy of pushing yourself to a limit and sustaining a high level of energy during a workout more than hurting yourself. Some of the things people do in the name of martial arts makes me shake my head. I want to be able to enjoy my retirement, not be crippled because I had to have tough shins.