[kidcolin]

thanks for your insights guys.

Smiley,

I agree that running for an hour is probably worse for your body. I know a few distance runners who have bad knees at the ripe old age of 25.

Blarg,

Good point about form. I recently started seeing a physical therapist for some minor back pain, and she showed me my form was all wrong on the crunches and push-ups I do. I can already see the difference, both in their effectiveness at working the muscles, and in the decrease of aches and pains.