My fat burning and fitness 12 day Fat X Program concludes with Fat Burning Workout 12.  As in all my workouts, there are simple tips that you can add to make the workouts more challenging for advanced users.   I've been asked for some tips to make this workout even better. So, for those of you that have done the Fat X Program (a.k.a FX 12), and you're ready for a bigger challenge, I'll list four tips you can use to make Fat X Workout 12 more challenging and even more effective at improving your fat loss and overall fitness.