Shaolin monks believe that strength comes from the mind, and with a properly trained mind, the body can become close-to-limitless.
Their practice involves a very specific type of Kung Fu, which is believed to cultivate harmony with nature while also disciplining the body/mind connection.
According to Wikipedia:
Shaolin Kung Fu (Chinese: 少林功夫; pinyin: Shàolín gōngfu), also called Shaolin Wushu (少林武術; Shàolín wǔshù) or Shaolin quan (少林拳; Shàolínquán), is one of the oldest, largest, and most famous styles of wushu or kungfu. It combines Ch'an philosophy and martial arts and originated and was developed in the Shaolin temple in Henan province, China during its 1500-year history. Popular sayings in Chinese folklore related to this practice include "All martial arts under heaven originated from Shaolin" and "Shaolin kung fu is the best under heaven," indicating the influence of Shaolin kung fu among martial arts. The name Shaolin is also used as a brand for the so-called external styles of kung fu. Many styles in southern and northern China use the name Shaolin.
In the photo series below, you will see Shaolin monks practicing grueling techniques, which center around balance, strength, endurance, and self-defense.
Enduring incredible amounts of pain, and barely flinching, these masters of mind are nothing short of awe-inspiring to witness.