A former NFL running back has shared his struggle with a serious health issue. Chris Johnson, who previously achieved a notable milestone of rushing for 2,000 yards, has been diagnosed with ALS.

Details of his condition were discussed on a national television program. Johnson appeared on ABC's "Good Morning America" to talk about his diagnosis.

Further information about Chris Johnson's ALS battle can be found in the original report, which provides more details about his experience and discussion on the morning TV show.