Chris Shivers, Professional bull rider

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PHOENIX -- Two-time PBR World Champion Chris Shivers, who plans to retire this fall, sat down with Scott Pasmore on the even of this weekend's PBR Glendale Invitational.

For two nights only, the toughest bull riders will take on the rankest bulls for the ultimate prize in the Toughest Sport on Earth: a gold buckle.

Shivers is slated to take on a bull named Panther, who was ridden just once during the  2011 season and has been covered a total of four times since 2010.

The Professional Bull Riders Glendale Invitational presented by Cooper Tires takes place March 17-18 at JOBING.com. Tickets can be purchased at www.Ticketmaster.com or at the Jobing.com arena box office.