Go inside the lives and gyms of four extraordinary athletes preparing for UFC 221. Former champ Luke Rockhold and KO artist Yoel Romero both aim to capture middleweight gold.

Subscribe to get all the latest UFC content: http://bit.ly/2uJRzRR

Experience UFC live with UFC FIGHT PASS, the digital subscription service of the UFC. To start your 7-day free trial, visit http://www.ufc.tv/packages

To order UFC Pay-Per-Views, visit http://www.ufc.tv/events

Connect with UFC online and on Social:
Website: http://www.ufc.com
Twitter: http://www.twitter.com/ufc
Facebook: http://www.facebook.com/ufc
Instagram: http://www.instagram.com/ufc
Snapchat: UFC
Periscope: http://Periscope.tv/ufc

Connect with UFC FIGHT PASS on Social:
Twitter: http://www.twitter.com/ufcfightpass
Facebook: http://www.facebook.com/ufcfightpass
Instagram: http://www.instagram.com/ufcfightpass