Wrestling was a sport in which two competitors entered a ring, typically bounded by ropes, where they tried to overpower each other bare-handed.
The Second Doctor once was forced to participate in an inter-species wrestling match, which involved him competing against a giant ape-like creature named Grok, and a single Cyberman. (COMIC: The Champion)
According to the Tenth Doctor it was also one of the original Olympic sports practised by the Greeks. (TV: Fear Her)
The Twelfth Doctor only considered real wrestling to involve zero gravity, tentacles and magic spells. (TV: Thin Ice)
The Great Zarb was a Wallarian wrestler. (TV: Carnival of Monsters)