Started in 2008 by Peter Van Geit, a Belgian who had been employed by an IT company in Chennai, the Chennai Trekking Club (CTC) was merely an attempt to find like-minded people for group treks and biking trips. Today, it is a 40,000-member non-profit group that organises a gamut of activities in various states (mostly southern) on weekends and weekday mornings. But it&rsquos far from your typical urban tour operator. Its excursions are driven completely by volunteers, and the expenses are divided equally among the participants. The event calendar of the club includes regular activities like treks on nearby wilderness trails, trail runs and outdoor swims, photo walks in and around the city, motorcycling tours in South and North India, as well as international destinations like Bhutan, and even two editions of the Chennai Triathlon.