Injured NASCAR star Tony Stewart is out of bed and walking again, entertaining fans while live-streaming from a treadmill Friday. At the same time Stewart was offering details about his wreck and recovery, Stewart-Haas Racing announced the three-time champion's replacement for the Daytona 500: Brian Vickers will drive the No. 14 Chevrolet for the season opener while Stewart recovers from a fractured vertebra. ''We are doing much better,'' Stewart said via the Periscope application. More...