It’s natural to stretch whenever you feel a bit stiff. Plus there's always that one coach hollering for everyone to do their stretches, especially in sports where flexibility is important. Ballet dancers and other performers need to make sure they’re limber as well.
In Japan, group stretches are also a part of gym class, so it’s not unusual to see teams of two going through a routine together.
Tokai Teio, Mejiro McQueen, and Gold Ship (from Uma Musume Pretty Derby) are getting ready for their race training, but what do you think the other characters might be preparing for?