This 23-minute circuit is a powerful mix of strength and endurance designed to push your limits. Start with 9 chest-to-bar pull-ups, focusing on pulling high to engage your back and arms effectively. Move on to 15 power cleans, using explosive movement to lift the barbell with proper form. Then, complete 21 air squats, ensuring your knees track over your toes and maintaining good posture throughout. Finish each round with a 400-meter weighted run (with a 45 lb vest or plate), which will test your endurance while carrying the extra load.