Chris Johnson 'not concerned' that his 40 time will be beaten

Name: Chris Johnson 'not concerned' that his 40 time will be beaten
Uploaded: 2015-02-21T17:14:39+00:00
Duration: 1 min 11 s
Channel: NFL Official
Description: Running back Chris Johnson joins the NFL Combine crew to discuss the competition to break his record 4.24 40-yard dash time.