i take most advantage "using" my breath observation in... any moment, any posture, any place i find my self: cuewing up somewhere, feeling arising emotions/thoughts i don't like as a soul, having little insonnia, travelling on long journeys by train, etc, etc, etciù!
and if my mind speaks too much, i sit silent and listen all "noises" listenable around me. also this can be done in any moment.
..aehm..i suspect that all this can be done in any moment and posture and can be quickly recalled after a period in which one sits down and analize/absorb the tecnique; afterwards a little perpetuated connexion with physical activity can help, yes. does this make sense?!