The Brownlee brothers won gold and bronze in the triathlon at London 2012 and are still very much on top of the world in their sport.
Johnny's joined his big brother Alistair to talk to Joe about their busy year ahead and being the best of buddies.
The brothers also tell Joe about the triathlon they're launching to encourage more people to give the sport a go.
Alistair also talks about his chances of competing in the 10km at the 2016 Rio Olympics.
Last year, Nel met the guys and gave them a quiz on each other - check out the Brownlee brothers' quiz battle!