See how the Olympic gold medalist swims through a pool with a glass of milk overhead.

On Monday, u.S. swimming gold medalist Katie Ledecky shared a video,media reported. In the video, she swims through a swimming pool with a glass of chocolate milk over her head, and can be seen seeing that the whole process is so smooth that the liquid in the cup is not spilled. “This is probably the best swim of my career!” Ledecky wrote.

See how the Olympic gold medalist swims through a pool with a glass of milk overhead.

This is not a strange event that Ledecky randomly decided to do, but rather from the Got Milk? Challenge campaign at TikTok, a promotional campaign from Milk Processor Education Program, a dairy-funded organization. The agency is reviving the popular Got Milk? ad slogan that began in 1994, encouraging people to share strange milk videos.

In another video, tennis player Sloane Stephens plays tennis with a glass of milk. Before the video, people do everything from opening milk with their feet, pouring milk, and jumping into a children’s pool full of cereal and milk.

See how the Olympic gold medalist swims through a pool with a glass of milk overhead.