Ann Gleave made the point, that when dance phrasing subsides to a quiet spot, that is the best time to exhale. The body will relax naturally thus reinforcing the intended point. Before a colorful energetic passage a dancer should inhale, said Ann. Sounds plausible to me though I have yet to try it. If anyone knows about inhaling and exhaling it is singers -- on the dance floor do you plan your breathing in advance, as you would for your singing?