Tribeca’s fitness obsession is getting another outlet: Barre Tribeca, opening October 1 on the second floor of 28 Warren (where Kula Yoga Project is on the fourth floor). The goal is to be more affordable, with barre classes for $25 and private Pilates sessions for $100. The women involved are artist Lisa Stefanelli (pictured below), who has lived in Tribeca for twenty years; fitness instructor Lisa Grossman; and Pilates director Annette Fletcher, owner of Pilates House on the Upper West Side. More when it opens, of course….