I just started with a Beachbody program, like P90X or Insanity. Do you have any good advice?
The best advice that I can give is to commit yourself to the Nutrition Guide! I tell all the people that I coach that your results are going to come from about 80% diet and 20% workouts. However, this does not mean you can slack on the workouts, because you still have to build muscle and burn calories to increase your metabolism, get stronger, and lose body fat.