CrossFit is a strength and conditioning program consisting mainly of a mix of aerobic exercise, calisthenics (body weight exercises), and Olympic weightlifting. CrossFit, Inc. describes its strength and conditioning program as "constantly varied functional movements executed at high intensity across broad time and modal domains," with the stated goal of improving fitness, which it defines as "work capacity across broad time and modal domains.

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CrossFit is a lifestyle characterized by safe, effective exercise and sound nutrition. CrossFit can be used to accomplish any goal, from improved health to weight loss to better performance. The program works for everyone—people who are just starting out and people who have trained for years.

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Workouts are different every day and modified to help each athlete achieve his or her goals. CrossFit workouts can be adapted for people at any age and level of fitness.

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The CrossFit lifestyle—a combination of diet and exercise—is the key to fitness and long-term health.

Everyone can do CrossFit regardless of age, injuries and current fitness levels. The program is modified for each person to help him or her safely become healthier and fitter. Grandparents and Olympians can perform modified versions of the same general workout. CrossFit is the program that will get you in shape. No matter what your current fitness level is, you can start CrossFit. As you become fitter, workouts will become more challenging. Every workout is designed to help you succeed, improve fitness and move you toward your goals. To accomplish your goals faster, we recommend you eat a variety of healthy foods in quantities that support fitness training but not body fat. By avoiding excessive amounts of refined carbohydrates and measuring your intake of protein, carbohydrates and fat, you will see dramatic, measurable increases in health.