Ekaterina Ivanova will help you understand the answer to this question.
Answer: Mobilization of fat from adipose tissue depots in case of the body's energy demand occurs approximately evenly across the entire storage area. Differences in mobilization speed depend on the number and sensitivity of individual receptors that react to situations of acute energy needs.
These receptor fields are primarily predetermined genetically, and more accessible depots may randomly coincide with zones of maximum muscle effort, which will inevitably lead to a reduction in the volume of these depots first.
But unfortunately, this is a question from the realm of probability theory. As for the abdominal muscles, unfortunately, an aggravating factor can be simple muscle hypertrophy in response to overloads, which will deprive you of your coveted waistline.