If people are sufficiently like mice, scientists have discovered another good reason to exercise.
Elaborate studies with laboratory mice seem to prove that exercise cleans junk out of cells and therefore has a renewing effect. OK, you say, I’ve heard that before. That’s what the guy in the park said about Dr. Z’s Magic Elixir — or was it Zillah’s Snake Oil?
No, these were real, white-coated scientists who bred special batches of mice. Made one batch diabetic, with extra fat in their arteries, and then made them run and run.