In the winter people tend to gain weight. The weather doesn't really invite outdoor activity, and holiday parties encourage over-indulgence. But I just discovered the best new workout in Boston that will keep you inspired all winter long: Bollyx. I attended a class with my Just Us Gals co-authors on Monday. Not only was it an awesome heart-pumping workout, but its also greener than going to a gym and using exercise machines. Even better, the dance studio is less than a 5 minute walk from the Central Square T stop!