Tim Tebow hasn't forgotten last year's intense debate over his ability to adapt to the NFL, so he's using this offseason to stay relevant in the Denver Broncos' quarterback derby -- and perhaps emerge as the starter. Tebow, who rose to fame while running the spread offense at the University of Florida, said Friday on Atlanta's WQXI-AM that almost all of his work this spring has taken place from under center, according to Sports Radio Interviews. "Well, I believe this offseason has been great," Tebow said. "Just working extremely hard, on the grind pretty much all offseason. I haven't taken a break. I've been working a lot on my drops from under center, I haven't done any shotgun stuff all offseason. Everything's just been under center -- straight drops, play-action fakes, straight drops, fives, sevens -- just working on all the throws. Accuracy and precision with my passes has been the No. 1 thing that I've worked on all offseason, and I believe that I've improved that a lot." Source: NFL.com