UFC Hall of Famer, Matt Serra, gets his heart rate up to assess his fitness levels through metabolic testing with Kate Baird, exercise physiologist at @HSpecialSurgery at the HSS Sports Rehab & Performance Center. How hard does Matt work out? Subscribe to get all the latest UFC content: https://ufc.ac/3u8FIJp Experience UFC live with UFC FIGHT PASS, the digital subscription service of the UFC. Visit https://ufcfightpass.com/ To order UFC Pay-Per-Views on ESPN+, visit https://ufc.ac/3NKBvmx (U.S. only) To order UFC Pay-Per-Views, visit http://welcome.ufcfightpass.com/#PPV (Non U.S.) ?? Shop official UFC Gear, visit https://ufcstore.com ?? Shop official UFC Memorabilia, visit https://ufccollectibles.com ?? Shop official UFC VIP Live Event Experiences, visit https://ufc.ac/3Oz2gLH Connect with UFC online and on Social: ?? Website: https://www.ufc.com ?? Twitter: https://www.twitter.com/ufc ?? Facebook: https://www.facebook.com/ufc ?? Instagram: https://www.instagram.com/ufc ?? Snapc