Fit grandpa offered a subway seat turns it down with gymnastics

It's considered polite to offer your seat to an elderly passenger (as subways often like to remind you). It's even more polite to take up space above the seats to make more room. 
This is the lesson taught by 68-year-old Wayne McEntire, an American currently in Rio de Janeiro with his grandson, Britton Barker. When offered a seat reserved for older passengers, McEntire turned it down with a reminder that not everyone his age needs that seat.
Which is to say, he hopped up on the subway pole