The Facts: Reports have been circulating throughout the league in recent days that Manning's rehab back from neck surgery has been progressing in a positive direction, and three sources with knowledge of Manning's rehab told NFL Network's Albert Breer that Manning steadily has regained strength in his grip and triceps. Now there's reportedly visual proof to confirm Manning's returning arm strength, as a 27-second video of Manning going through an aggressive throwing session in his Colts helmet, shoulder pads and jersey at Duke University appeared on YouTube late Friday.

Diehards Line:A source confirmed to Breer on Saturday that the player in the video was Manning. In the video (you can watch it HERE), which appears to have been taken from behind a goal post in an end zone, Manning can be seen throwing deep balls and "out" routes to either side of the field. ESPN reported that Manning has been conducting throwing sessions under the supervision of Duke HC David Cutcliffe (Manning's offensive coordinator at the University of Tennessee) since Tuesday. Sources also said that Manning has been in Durham, N.C., with Colts teammates Dallas Clark and Austin Collie and ex-teammate Brandon Stokley. ... In case you somehow missed it, Manning is due a $28 million option bonus on March 8, and speculation has persisted that the Colts will release Manning before that date.