CTC organizes member-led treks during weekends, and travels through mountains and wilderness areas in the Eastern Ghats and the Western Ghats. Occasionally, long treks are organized in the Himalayas. CTC's growth is attributed to a large fan base, mainly in South India, and to the volunteers who spend many hours researching and organizing the treks. It also has members from outside India, mainly expatriates who live or lived in Chennai and Bangalore and became part of CTC. In addition to providing a nice break from urban and corporate life, activities organized by CTC stimulate awareness of environmental issues and encourages physical fitness among its members. Chennai Trekking Club organizes periodic photography trips and treks especially for those members who are interested in Natural and Wildlife photography. Photography workshops for members are also conducted by experienced wildlife photographers. In addition to all these things CTC organizes social treks with unprivileged kids, tree planting and maintenance activities, lake cleanup, and beach cleanup. CTC also organises yearly trail marathons and trained hundreds of aspiring runners.