The subject of chest beating falls naturally under Technique. It is a technique, but there's been a recent question about it on another subforum here, questioning what it was. The most recent excellent example I've seen was: "35 mph winds and 3 foot waves isn't much. Paddled in much worse." And from the same author, discussing the same topic on another kayaking website: "My daughter and I went out once and were warned of a front coming through in an hour. It did and possibly picked up to near 30 knots. We rafted and ran with her comment, 'Boring', as we ran home."
Now let's see what Derek Hutchinson says about 35 mph winds: "Force 7, Moderate Gale, Very Difficult. You must be strong and experienced; your equipment should be good. Seas are big. Kayaks difficult to turn. Very difficult to make headway. Wind catches at paddle blades. Foam is blown off in long white streaks, lots of spray. Communication very difficult."
Chest beating, then, is stating that Force 7 isn't much, and that you have paddled Much Worse. Force 8 maybe, Gale? Or maybe Force 9, Strong Gale? Hutchinson is almost poetic in his descriptions of these as experienced by the kayaker out in such conditions. To be accurate, though, the author of the Much Worse remark did somewhat lessen the punch of the outing with his daughter by stating the wind "possibly picked up to near 30 knots". This more like chest tapping, but a hand-held anemometer would have allowed him to state the wind strength with more authority. The hand-held anemometer is the must-have piece of technology for truly believable chest beating; I never paddle without one.