Reducing stomach and practicing abdominal muscles can be carried out at the same time, because stomach movement can be achieved through the most effective sit-ups. Now you do 70 sit-ups in the morning, noon and evening, plus 35 minutes of running in the morning and evening. Don't eat and hydrate after dinner and before going to bed, and move the hydration time to daytime. If you stick to this for three weeks, your stomach will be thinner and your abdominal muscles will be formed. You need to keep doing it until your abdomen is flat and you have abdominal muscles.