that the inventor of the dumbbell was tom owen a heavyweight champion professional boxer . he lived from 1768-1843. he used it for conditioning . it worked he boxed for over 30 years at a high level.
Good post Funky Bro.. yes a very tough early bare knuckled boxer.. who invented the Dumbbell be it solid and early exercises as we know today. In France too the Dumbbell was a training tool even for Savate Boxers. Indeed when i boxed we used light weights in punching. Develops real stamina to keep holding your hands up. I think we can thank Tom Owen too for the Nieder press.