Originally Posted by
AlmostTrick
It's true that for a given effort, extra weight will just cause you to go slower. But if you're in a fast group ride, you will be forced to give MORE effort just to keep up. No one likes to be dropped. So yes, adding extra weight most certainly can make you stronger/faster.
I'd rather find a faster group to ride with and struggle not to be dropped without carrying any weights. More fun IMO.