The Brownlee brothers. Triathletes. Legends.
Today, a lot of people are sharing a clip from the ITU Triathlon World Series, which shows the lengths the Brownlee brothers got to to support each other.
Towards the end of the race in Mexico, Jonny was clearly in trouble and looked as if he was about to collapse at any moment.
Alistair then swooped in to pull Jonny forward, sacrificing his second-place position in the race.
He hauled him all the way to the finish.
Henri Schoeman from South Africa overtook the Brownlee brothers and then won the race.
When the Brownlees got to the finish line, Alistair then pushed his brother over the finish line.
Jonny was then immediately checked by medical professionals when he crossed the finish...
And was sent to hospital as a precaution.
In an post-race interview, Alistair explained that he pushed his brother to the finish line to ensure that he was close to medical professionals.
If it happened to anyone I would have helped him across the line. To be honest, it's an awful position to be in. If he conked out ... away from the finish line there and there isn't a medical support, it's a dangerous position to be in.