Denver Broncos rookie quarterback Tim Tebow, front, looks to pass the ball under the watch of head coach Josh McDaniels last week at practice.

Tim Tebow missed his first practice of training camp after jogging off the field during warmups on Wednesday.

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.