CrossFit is a high-intensity workout that builds strength and cardiovascular endurance through exercises targeting large muscle groups. Workouts are usually named after fallen heroes and last 30-40 minutes, combining exercises like weightlifting, gymnastics, and calisthenics in interval training sessions. While CrossFit provides benefits like improved strength and weight loss, the rapid, heavy exercises also carry risks of injury if improper form is used. Participating in CrossFit involves joining a local gym called a "Box" where members support each other's fitness goals and can compete together in challenges.