Plaxico Burress is no Jeremy Shockey, at least when it comes to playing on a bad ankle in training camp. Shockey pushed himself a year ago on a sprained ankle, and it ended up bothering him during the Giants' regular season. Burress isn't making the same mistake. The receiver hasn't practiced since spraining his right ankle on Aug. 2. His hours on the field at the U. at Albany over the last 12 days have been spent either watching Eli Manning and the offense work or riding a stationary bike.