He attended Glan Afan Comprehensive School in the centre of Port Talbot, and Neath College where he started a half back combination with Martin Roberts.

At senior level and before making the step up to regional rugby with the Ospreys, Hook enjoyed great success for Neath RFC, becoming the record holder for the highest individual points tally within a season.

Hook played his way into the Ospreys first XV in the 2006–07 Magners League season, giving outstanding performances at both fly-half and inside centre.

He kicked a conversion in a Pool 3 match against the Sale Sharks during the 2006-07 Heineken Cup, clinching the Ospreys win following a try from Shane Williams.

[3][4] On 2 June 2014, Hook was granted early release from USA Perpignan, following their relegation from the Top 14, to join Gloucester Rugby in the English Aviva Premiership on a three-year contract.

Hook made his international debut against Argentina under new Welsh coach Gareth Jenkins, scoring a late try in the match.

During the 2007 Six Nations Championship, Hook played in all of Wales's games, but was hampered by being employed at inside centre, rather than in his preferred position of fly-half for the first four matches.

He was called into the squad as a utility back to cover his Wales teammate, Leigh Halfpenny, who was forced to withdraw from the beginning of the tour with a thigh injury.

He mentioned wanting to remain involved in rugby by coaching, with focus on skills, but also with his first children-stories book in the release process.

[11] In 2021, Hook took part in S4C's Welsh language learning programme Iaith ar Daith, being paired with referee Nigel Owens as his mentor.