Nenad Krstic spent his nine months of rehab wisely. Unable to work much on his post moves, the Nets' 7-footer added 15 pounds of muscle to his upper body and a few feet of range to his jump shot. But he won't be able to show off either in game situations for most of the preseason. A MCL sprain a few weeks ago caused him to lose a month of rehab. Still, he and the Nets are aiming at opening night for his return.