For my first 15 minutes on the treadmill, I do quasi-curls with 15 pound dumbbells. It doesn't sound like much, but it accrues. 15x60x15 = 13500 pounds per arm. My arms get weak and rubbery.
Toward the end of this workout segment the other day, the following joke occurred in the Simpsons episode I was watching.
Actress: "I don't see why I have to be nude in this scene. It's totally not necessary. I mean, Katherine Hepburn never appeared nude in any of her movies."It was at this point that I laughed so hard that it knocked me off-balance, and the treadmill sent me spinning into the closet door behind me, the dumbbell punching a nice hole into it.Director: "There's still time."
Still worth it.