You've Done Worse Things For Ten Seconds

In the balancing stick posture (the last of the balancing postures), where the heart rate doubles, my instructor would always say to hold the pose for ten seconds because "you've done worse things for ten seconds". She's stopped saying that now. Probably wise because my mind would try and wonder what she was implying, what worse things have I done for ten seconds that she may know about, what has everyone else done in the room that can be worse than this?!