David Dahl — finally — gets a chance to be a baseball player again. The Rockies’ talented outfielder, who did not play in a big-league game last season, is scheduled to begin swinging a bat again as he gears up for spring training. “I start swinging Thursday when I get back to Scottsdale,” said Dahl, who will resume working out at the Rockies’ Talking Stick facility in Arizona. Dahl, 24, has not played since a July 31 game with Triple-A Albuquerque, and has not swung a bat since. He suffered a stress reaction injury to a rib during spring training and played in just two Cactus League games before he was shut down. The pain and tenderness in his upper back, near where the rib connects with the spine, flared up whenever he started swinging a bat. Dahl has been working out extensively, building up leg strength, but he has not swung a bat because Rockies’ trainers wanted to make sure he was completely healed. His healthy return would be a huge bonus for the Rockies, who need another power bat in their lineup.