CrossFit is a high-intensity fitness program that incorporates elements from various sports and types of exercise, including weightlifting, gymnastics, and cardio. The program was created in 2000 by Greg Glassman and has since gained a large following of devoted practitioners.

CrossFit workouts, also known as WODs (workouts of the day), typically include a combination of exercises performed at a high intensity for a set amount of time. The exercises can be customized to the individual's fitness level and can include movements like pull-ups, push-ups, squats, lunges, and kettlebell swings, among others.

CrossFit also emphasizes functional fitness, or the idea that the exercises performed in the program should mimic movements that people perform in their everyday lives. This approach is meant to improve overall physical fitness and help people be better prepared for any physical challenges that come their way.

CrossFit is known for its community-driven approach to fitness, with many CrossFit gyms (also known as "boxes") fostering a sense of camaraderie among members and encouraging friendly competition during workouts.