Zwift International is a company that operates an online platform offering an interactive training experience for cyclists and runners. Through the use of their app, Zwift provides virtual routes and structured workouts that can be accessed using indoor cycling trainers or treadmills. The platform allows users to engage in virtual races, group rides, and other challenges to enhance their fitness routines. Zwift International is part of the broader Zwift brand, which is known for integrating gaming elements with physical exercise to create a unique and motivating training environment.