Bend your knees and duck down, rolling your head in a 'U'shape under the punch from 'inside' to 'out.

BBC: DEFENCE

Help is on the way. (Applause.) Just bend your knees.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event -- Sterling, VA

I'm going to talk for a while. (Laughter.) You guys don't sit down because you don't have chairs. (Laughter.) But you guys all have to bend your knees a little bit so you don't faint.

WHITEHOUSE: The White House

First of all, if you've got a seat feel free to take a seat, because I'm going to talk for a while. (Applause.) Point number two, if you don't have a seat, bend your knees because sometimes people faint a little bit -- all right -- and you've been standing here a while.

WHITEHOUSE: The White House