"You want to take up sports? Maybe you just like hanging out at the mall. Either way, you need expensive designer sports wear. And there is no better than ProLaps. Unless you like Eris more, but that is a matter of taste, for people with no taste."
ProLaps stores in San Andreas are accessible to the player, however they're inaccessible in GTA IV. It is based on the real-life clothing brand Reebok. The company's slogan is "Train Hard". On many billboards in San Andreas, an "S" is spray-painted in front of the 'Train' making the motto "Strain Hard".
The owner of the store in GTA San Andreas is implied to be a homosexual. This is apparent based on the comments he gives the player such as, "You're welcome anytime, honey buns" or "We have a wide range of thongs, too".
The name Prolaps is a play on the word Prolapse, more specifically, a Rectal Prolapse. Together with the store's motto "[S]Train Hard", the joke behind the name is revealed, as a rectal prolapse is commonly caused by intense/prolonged straining during defecation.
In Playboy X's room in his safehouse, you can see a shoe box purchased in ProLaps.