Wear a jock strap.
Jock is the slang term for an athlete. It is a reference to a jock-strap, a men's undergarment used specifically for sports.
put it on like a pair of underwera
Has visto mi suspensorio?
the one you can wear in public
Put the cup in the jock strap and tell him to wear it like underwear...
If you want to question mark? \
It's a little bit uncomfortable at first to wear a jock strap, especially if you're not used to it. But it feels better to have good support when you run, and to not worry about getting hit down there.