What are the differences between the workout program P90X and running, and which one is more effective for overall fitness and weight loss?

P90X is a structured workout program that combines strength training, cardio, and flexibility exercises, while running primarily focuses on cardiovascular endurance. P90X can be more effective for overall fitness as it targets multiple aspects of physical fitness, while running is more specific to cardiovascular endurance. For weight loss, both can be effective depending on individual preferences and goals.