I do think it’s a bit silly, but it’s apparently something that presidential candidates have done for decades, just some way to “prove” that they are physically fit to lead and aren’t going to suddenly croak partway through their administration from some condition they’re covering up. As if that actually serves as any real proof when their doctor will basically publish whatever they tell them to, but easy to see how the whole practice gets weaponized during an election when “everyone does it”.