Q. I am a young cyclist trying to race semi-pro in the national mountain-bike series. I need to improve my VO2max and lactic-acid threshold. What sort of training should I do? - Evan, Bay Area, Calif.

Body language – nonverbal communication – is not a language in the technical sense, and we don’t receive any formal training in it. As a result, we have to learn the dos and don’ts pretty much on our ...