The workout center wants Atlantans to go green this month with a special promotion. In an effort to cut down on pollution, Blast900 is giving away a free reusable Blast900 water bottle to every person who attends a class through Saturday. (Never been? Your first class is free.) This offer is available at both the Dunwoody and Buckhead locations; one water bottle per person. Blast900, 56 E. Andrews Drive NW, Atlanta; and 5521 Chamblee Dunwoody Road, Dunwoody.