Energy intake-energy consumption =+/-lose weight.

What do you mean? In other words, if you subtract the energy you consume through exercise from the energy you consume from food every day, if it is negative, it means that you are consuming your own energy. Simply put, you are losing weight.

If you want to lose weight, you must control your diet, don't eat high-calorie food, control your fitness time for more than 40 minutes every day, and do more aerobic exercise, such as running, mountain climbing, cycling, useful, and so on. Heart rate control is better when you feel a little short of breath.

Let's talk about strength training and push-ups first. According to your current weight, I estimate that it is not easy for you to do 15. Do what you can, preferably in groups of 20, and do 3 to 5 groups every day. Rest time should not exceed 1 minute. As for sit-ups, your foundation is not very good. Start with a group of 10, and then gradually accumulate according to your own situation. Read more about the explanation of sit-ups. Maybe there is something wrong with your movements, which causes your stomachache.

Come on! As long as you insist, there will be no problem!