Answer: Endurance refers to how long an aircraft can fly without stopping. It also associates for other defenitions in war planes. It refers to how long an aircraft can hold after it was hit by a bomb or how much attacks a airplane can hold.
Answer: Rugby is very physically demanding. You have to be able to run for 80 minutes straight with very few breaks in the play and you must also be able to sprint at any given moment. Due to rugby being a contact sport you must also have the ability to take hits and deliver them all game.
Answer: There are basically two types of muscle fibers in our bodies that we have voluntary control over. One is called "red" muscle, and the other is called "white". Red muscle fibers have the ability to perform work over longer periods of time without fatigue. White muscle fibers are able to work hard, but for a shorter period of time than red fibers. An endurance athlete will have exercised his or her red muscle fibers (through long exercise sessions), so that they grow stronger and bigger. This means that their body will have the ability to do work for much longer than a person who only exercises for shorter periods (and exercises their white muscle fibers).