The Chicago Bulls' Derrick Rose has been open about the fact he has been trying new stretching routines over the past few months in order to keep his body in check as he continues working his way back from reconstructive knee surgery in May of 2012.

In particular, Rose has been stretching in the middle of games, an occurrence which was rarely seen before his knee injury. As part of Rose's in-game treatment, he sits on the floor and uses a softball to loosen up his leg. After using the softball for a few minutes, Rose switches to a racquetball-sized ball to continue the process.

Rose said earlier this week the new routine has less to do with his left knee and more to do with his hamstrings.

"It's really my hamstrings," he said. "My ACL, if you have ACL problems, your hamstrings will be the first thing to tighten up. So for me it's always keeping them loose and making sure they don't get tight and that's how you prevent injuries."

Rose has played 43 minutes in his first two preseason games combined.