Troy Tulowitzki, who ramped up his rehabilitation Wednesday with a full round of batting practice, said that the Rockies' fall to the bottom of the National League should force the team into changes before next year. "I think that's why I came out numerous times and said I want to win," Tulowitzki said. "It doesn't mean I want out of here. It means I'm sick and tired of losing. "Something needs to change. Hopefully that comes fairly quickly. You can't force it. But at the same time, we're all frustrated with this year — especially me." When Tulowitzki re-joins the Rockies lineup, he'll parachute back onto a team in the midst of a free fall. The Rockies entered play Wednesday on a five-game losing skid and losers of eight of their past nine games. Tulowitzki said it's important for the Rockies to show improvement over the final weeks of the season. "Finish strong and end the season strong. It's been a rough year. But end it on a good note and head into next season hopefully things looking up." Tulowitzki's .340 batting average and .432 on-base percentage remain the best in baseball. And his .603 slugging percentage is second best. But the frustration of another lost season wears on the all-star shortstop. "It's very hard," he said. "It'd be easy to just pack up things and throw these games away and say, 'Hey, we're out of this thing.' And move on to next year. But in that clubhouse, we need to finish strong and end on a good note. Some guys need to prove themselves for next year. And some guys need to get more experience to help out the team."