Chris Gayle: West Indies batsman on being 'unbeatable'

West Indies batsman Chris Gayle says his hard work in training ensures he feels "unbeatable" and helped him to the fastest-ever century in professional cricket.

Ahead of the ICC Champions Trophy, Gayle also says that the first game - against Pakistan on June 7 - will be "vital" to get out of a "tough" group.

Speaking at the launch of the Chris Gayle Academy in London the Jamaican adds that England are currently playing "better cricket" than Australia ahead of the Ashes in July.