I just introduced my girls to the joys of sugar-free gum, and boy, do they love it. Their excitement is infectious and I have started noticing how many people chew gum at the gym. Having had the dangers of chewing gum while running drilled into my head at various sports practices in my youth, I just can't fathom chewing gum on a treadmill. Plus I breathe through my mouth and can just imagine the gum flying across the room. How about you . . .