If your goal is to gain muscle and lose fat, it should be anaerobic for 45 minutes and aerobic for more than 45 minutes. This is a more scientific fitness method. Usually, after 30 minutes of aerobic, the metabolism will burn the body fat to a certain amount, but it will be more troublesome if it is thin abdomen, because if the fat burns 100%, it will consume about 30% of the abdomen, so it needs a process and persistence.
It's best to have muscles, and then do aerobic exercise, because aerobic exercise will consume muscles besides your fat, and enough muscles will also help you consume body fat. 1 lb muscle will help you burn 50-70 calories on average every day.
In order to gain muscle, besides the movements you do, you'd better make a plan before, such as how much to measure and how much to accomplish every day, and complete it in the form of movements+groups. For example, today's goal is to hold your head back, pull-ups 15 *3 groups, hard pull 15 *3 groups, and dumbbell bending 20 *4 groups, vertical.
Then there is diet, less oil and less sugar, more fiber and more fruits, plus 8 hours of sleep guarantee, 1 month or so, the body shape will change slowly, the cardiopulmonary function will improve, and the metabolism will accelerate.
From 3 months to 6 months, body shape began to change, body fat decreased and muscles began to appear. There is an essential difference after 1 year.