Michael Phelps and Kevin Plank during Under Armour Keynote at the 2017 International CES .

Michael Phelps performs a jump test on stage with Kevin Plank, Under Armour Founder and CEO, during his Keynote Address at the Venetian during the 2017 International CES, a trade show of consumer electronics in Las Vegas, Nevada, January 6, 2017. The jump test is performed with shoes that measures the rediness of an athlete prior to working out. Photo by Molly Riley/UPI