That's fit besties, obviously. They may be gym or sports buddies, maybe not - but definitely they both keep themselves in shape. A selection of wrestling buddies there, each pair trying to out-flex and out-agression one another. But best mates really.    

 Don't overlook 'having fun with our friends' when thinking 'fitness'. Everyone deserves a bit of down time, even if (some) do spend it flexing and posing.   Actually, they're twins