Dr. Berg > The more intense the exercise, the more stress occurs, which
means cortisol is triggered. Cortisol nullifies the fat-burning
hormones. So you have to do short-duration intense exercise with lots
of rest in between. You want to make sure you don't exhaust the body,
just the specific muscle. You also don't want to do this every day. Do
it every other day, because fat burning occurs in the rest periods

Right.  High intensity exercise performed infrequently.  I don't like
the statement "don't exhaust the body, just the specific muscle."
Technically, it's correct, but most would read it to mean that you need
to back off the intensity.  You need a full body workout (not split
between upper and lower) with each single set to exhaustion.  Start
with the largest muscle groups down to the smallest.  No more than 12
exercises per workout.