But I
think there's a little more packed into your question: While high - intensity
training (a higher heart rate) can make you
lose fats fast, the problem is that too much
of this means a level
of stress that causes your body to stop burning fats and instead burn sugar, which means that you rebound and gain even more fats.
I've
trained several bikini competitors whose butts looked amazing two weeks out, and then come stage time, they look flat and so I
think what's going on
there is they
lose a lot
of the intracellular water and things like that.