Laughter as Exercise

This article talks about how laughter seems to help with the release of endorphines and because of that it can help pain relief.  It also reminds me of the saying "misery loves company" not because laughter is miserable, but because they found that when people laughed in a group they got more pain tolerance than when they laughed alone.  We are social beings.  Maybe that's why I can weight lift for 60 minutes in a class, but can't lift for 5 minutes on my own!