Fitness challenges are structured programs designed to motivate individuals to improve their physical health and well-being. These challenges often involve specific goals, such as increasing strength, endurance, or flexibility, and can last from a few weeks to several months. Participants may track their progress through various metrics, such as weight loss, workout frequency, or performance improvements. Many fitness challenges are organized in groups or online communities, allowing participants to share their experiences and support each other. Popular examples include 30-day workout challenges, step challenges, and weight loss competitions. These initiatives can foster a sense of accountability and camaraderie among participants.