How do you guys hide boners?

For me this is a problem bcuz I wear sweatpants for gym class, since we usually workout outside and it’s cold in the winter. I’m naturally big, so it’s hard to hide my bulge whenever I’m working out, especially if I am doing an exercise where my shirt lifts up. Whenever I get a boner, I’ll have to either distract myself so I don’t get harder, or just pray that nobody sees it out of the top of my boxers. If I’m ever at full mast, it’s basically over