Pagano Joan. Strength training for women: Tone up, burn calories, stay strong

New York: DK Pub., 2005. - 160 p. : col. ill. - ISBN 0–7566–0595–4Most people are familiar with the term strength training, but they may not be aware that it is a method of resistance training, a broader category that also includes endurance training. Resistance raining (also referred to as weight training or weight lifting) is the technique of applying resistance to the muscles to stimulate growth (hypertrophy) of the muscle fibers and increase circulation to them. Skeletal muscle is composed of two different kinds of fibers: slow twitch and fast twitch.The body uses slow-twitch fibers for prolonged endurance work, while fast-twitch fibers provide strength and power for higher-intensity demands.
Depending on the training method you use, you can develop both strength and endurance in the muscles.Strength is measured by the amount of force you can produce with one all-out effort; endurance by the number of times you can sustain a muscular contraction before you fatigue. Strength allows you to lift a case of baby formula into the trunk of a car, while endurance allows you to carry your grocery bags home from the store.