Published: Aug 19, 2010 1:39 AM EDT
Updated: Aug 18, 2010 10:39 PM EDT

      ENGLEWOOD, Colo. (AP) - Tim Tebow missed his first practice of
training camp after jogging off the field during warmups on
      The Denver Broncos aren't saying why the rookie quarterback from
Florida had to leave the workout.
      Tebow, who didn't participate in wind sprints after either of
Tuesday's practices, huddled with head athletic trainer Steve
Antonopulos shortly after warmups began Wednesday afternoon and
then jogged off the field and into the team's headquarters.
      He didn't return, and the team canceled his scheduled gathering
with reporters afterward.