Andy Roddick

Tennis Commentator & Former Co-Host of Fox Sports Live; Retired World No. 1 Tennis Player & International Tennis Hall of Famer

Lance Armstrong

World Champion Cyclist, Olympian & Cancer Survivor

Austin Mahone

Pop Singer-Songwriter

Brooklyn Decker

Actress, Model & Tech Entrepreneur

Chip & Joanna Gaines

Owners of Magnolia Homes & Personalities on HGTV's "Fixer Upper"

No Pain, No Gaines: The Good Stuff Doesn't Come Easy

Ted Cruz

34th U.S. Senator from Texas

Ted Cruz | Full Q&A | Oxford Union Web Series

Michael Dell

Founder, Chairman & CEO of Dell

Elijah Wood

Actor; Best Known for the Role of Frodo Baggins in the "Lord of the Rings" Trilogy

Matthew McConaughey

Academy Award-Winning Actor, Writer & Philanthropist

Greenlights

Willie Nelson

Country Music Singer-Songwriter Known for "On The Road Again" & "Always On My Mind"