Ultimate Fighting Championship (UFC) Lightweight Champion Ben Henderson will put his 155-pound strap on the line against division number one contender Nate Diaz at the upcoming UFC on FOX 5: "Henderson vs. Diaz" event, which was recently made official for the KeyArena in Seattle, Washington, on Sat., Dec. 8, 2012.

This is an inside look at his training.

Henderson (17-2) usurped the throne with a unanimous decision win over Frankie Edgar at the UFC 144 pay-per-view (PPV) earlier this year in Japan. It wasn't "The Answer" promotion president Dana White was looking for, so the former champ got another chance to set things right.

He was denied at UFC 150 back on Aug. 11.

That means the division moves on without him and with "Bendo" taking over the reigns, his first stop will be in the 209 to face one of the most talented (and entertaining) lightweight mixed martial arts (MMA) fighters under the ZUFFA umbrella.

Diaz (16-7) punched his ticket to the title showdown by beating the brakes off Jim Miller at the UFC on FOX 3 event in New Jersey, outstriking the hometown hero before choking him out for his third straight win. Prior to Miller, Diaz put a hurtin' on Donald Cerrone and added Takanori Gomi's arm to his Stockton trophy case.

But is he championship material?

UFC on FOX 5 will also feature a co-main event between Mauricio Rua vs. Alexander Gustafsson, who battle for a spot in the light heavyweight pecking order. B.J. Penn vs. Rory MacDonald also rounds out the top-heavy network television fight card.

See more on this upcoming event right here.