An article on the Sydney Morning Herald website (and presumably in the print edition) states:
Stand-up paddle boarding lives up to the hype
I’ve discovered just how much work it takes for what I mistakenly assumed was a mainly sedentary sport.
Sedentary, as in “requiring or characterised by a sitting position” (from Latin sedēre, sedēns)? Maybe, because Dictionary.com’s second definition is “accustomed to sit or rest a great deal or to take little exercise” (emphasis added). Etymology isn’t destiny.
And cheers to the writer for actually doing it. Because of my (non-)sense of balance I wouldn’t be able to stand up, let alone paddle.
(Note: the writer/subeditor uses stand-up paddle boarding. The Wikipedia article is titled standup paddleboarding.)