Murray sidelined by poor hydration, Chip Kelly says

Eagles running back DeMarco Murray. (Michael Bryant/Staff Photographer)DeMarco Murray sat out team drills during the first day of practice Sunday because of poor hydration levels, Eagles coach Chip Kelly said Tuesday. That ended the mystery of Murray's absence after the running back had said he did not know why the coaches held him back.

"We did a hydration status test and he was a little bit high and obviously when you see guys that are high from a hydration standpoint, then you kind of pull them back a little bit because that's when they are susceptible for an injury," Kelly said.

The Eagles' training staff monitors the hydration levels of every player each day. It is part of the effort to…