Let me tell you about one of the dumbest workouts I've ever seen.
No, it wasn't somebody doing sprints in Shape Ups. Last week I saw an oldish man in my building's workout room, wearing khakis and a plaid button-down (always a red flag). When I arrived, he was doing bicep curls with 3-pound weights, one in each hand. Aw, I thought, he has to use really light weights because he's older. And he's counting out loud because he can't remember how many reps he's done! (It was 20.)
Then he put down the 3-pound weights and picked up the 5-pounders, and did the same 20 bicep curls. Then the 8-pounders: 20 bicep curls. Sure enough, standing in front of my elliptical machine, he worked his way down the entire rack of free weights. Then he moved to the heavier weights on the other wall. "Unh...one! Unh...two!" He grunted through ...