A 93-year-old Irish man is so fit that he's become the subject of a case study — and for those who aren't exercising regularly, take hope: he didn't start working out until he was in his 70s.
Also, if you happen to be nearish to a body of water, it turns out there's specialized machine for this type of training, it's called a row boat. As for me, I'm showing up tomorrow with my rowboat at the lap swimming pool. LoL