In order to reduce belly fat, we can run, which is the cheapest and simplest way to keep fit. 40-year-olds spend most of their time at work and little time on sports, so we can buy a treadmill in the city and do some sprints when we come back from work at night. It takes about half an hour to run. Try running five or six kilometers a day for a month, and you will see the effect. Don't do strenuous exercise.
In order to reduce the fat on our stomachs, we can also swim and ride bicycles. Some people especially like swimming, because they like the feeling of swimming in the water, but some people also like bicycles and the extreme state. No matter what kind of exercise you like, these two kinds of exercises can help us to lose the fat on our stomachs, as long as you stick to it.