Chris Johnson, a former running back with the Tennessee Titans, New York Jets and Arizona Cardinals who once rushed for more than 2,000 yards in a single season, has revealed that he has been diagnosed with ALS.

Chris Johnson, a former running back with the Tennessee Titans, New York Jets and Arizona Cardinals who once rushed for more than 2,000 yards in a single season, has revealed that…

Johnson shared his diagnosis in an exclusive interview with "GMA" co-anchor Michael Strahan.

Johnson was drafted by the Tennessee Titans in 2008

Former NFL running back Chris Johnson revealed that he has been diagnosed with sporadic Amyotrophic Lateral Sclerosis at the age of 39.

Tennessee Titans legend Chris Johnson revealed his ALS diagnosis in a Monday interview on Good Morning America.