Ascending in laps. We started at 3 and went up to 8.
When I got my ACE certification (back in the olden days; I was in the first group to do this) we were taught never to do any impact aerobic moves with weights. I use 3 lb. ones, while everyone else uses 5 and 8s. I really don't see the point, but I do it. I did notice that all, including the very fast tri-athlete, were running slower than usual.
However, I do enjoy the evil one's class a lot more when she does stuff like this, and more cardio, in general. She always praises me during these segments, but it's almost like she's saying, "Oh look, the old person can actually do something better than the others."