Reach (also known as wingspan) is the physical measurement of the length from one end of an individual's arms (measured at the fingertips) to the other when raised parallel to the ground at shoulder height. The average reach correlates to the person's height and is measured in inches.
An above average reach is an advantageous in sports such as basketball and boxing. For instance, the boxer Lennox Lewis has an 84 inch reach despite being 77 inches in height. This unusually long reach allowed him to hit opposing boxers from relatively safe distances where they could not reach him.
However, some boxing acadamies measure reach from under the armpit of the leading arm to the end of a closed fist.