<p>Aaron Baker, right, a former motocross racer who was paralyzed from the neck down in a crash while practicing on a motocross track in 1999, exercises at the Center of Restorative Exercise in the Northridge section of Los Angeles.</p>
June 13, 2015
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June 13, 2015 9 p.m.
Returning from his worst day
Former quadriplegic runs, walks to show others they can
LOS ANGELES - The worst day of Aaron Baker's life wasn't when the then-20-year-old professional motocross racer crashed his bike one spring day in 1999, flew over the handlebars and hit the ground head-first, paralyzing him from the neck down.