American heavyweight boxing champion Muhammad Ali covers his eyes with his hand during a training session at Chris Dundee's 5th Street gym, Miami Beach, 1971. (Photo by Chris Smith/Popperfoto via Getty Images/Getty Images)
American heavyweight boxing champion Muhammad Ali covers his eyes with his hand during a training session at Chris Dundee's 5th Street gym, Miami Beach, 1971. (Photo by Chris Smith/Popperfoto via Getty Images/Getty Images)