[Plagus]

Допис від ИНЕ

На самом деле у термина "Action" есть вполне конкретный автор. Вот что он понимал под этим.

Action
Rod action refers to the flex characteristics of a rod, varying from Slow to Extra-Fast. An Extra-Fast action rod flexes mainly at the tip. Slower (or softer) action rods flex throughout the entire length of the rod. Moderate action falls in between. We tailor the action of each of our rods to the particular fishing application for which they're designed, taking into account the preferred lure action, optimum casting range, fighting power, the feel of the rod, and countless other variables.

Или так
http://www.garyloomis.com/vproducts-10.html