They're young and athletic. They're also ill with a condition called POTS

In case anyone wants to know what POTS is: Postural Orthostatic Tachycardia Syndrome . Basically when you stand up quickly from a prone position you get fast heart rate, dizziness and fatigue.

First described more than 150 years ago, the syndrome has proliferated since the coronavirus pandemic. Before 2020, 1 million to 3 million people suffered from POTS in the United States, researchers estimate. Precise numbers are difficult to come by because the condition encompasses a spectrum of symptoms, and many people have still never heard of it. Recent studies suggest 2 to 14 percent of people infected with the coronavirus may go on to develop POTS.