Too Much of a Good Thing

There are a couple of women at my gym whom I have noticed working out every day, and for up to three hours. 

This is not only unnecessary, but actually detrimental. Unless you consume carbs and protein during the workout, you go into a catabolic (muscle breakdown) state after an hour or so. It also doesn't work to do the same workout every day - the body is too smart, and it adapts.

If the goal is to burn fat, the best way to do it is to do weights to build some muscle, and at another time, some intense cardio that uses the muscles you've built. 

I can't believe I'm giving this away, but there it is. You're welcome.