1. Do sit-ups before going to bed at night, and do them in the morning, and stick to them every day.
Don't eat dry food such as biscuits when eating snacks, and don't drink drinks with lemon. Pay attention to foods that are too greasy. Persisting for such a long time will certainly have an effect, but most people can't. I hope you can.
As for your skin, try to buy some facial cleanser that shrinks pores, but don't use too much. Usually three times a week is enough. The most important thing is to wash your face and go to bed before ten o'clock every night, and it is best to fall asleep at half past ten. Peas should eat less spicy food such as coriander.
I wanted to elaborate, but you asked not to be too long, just to be simple. I hope you can stick to it.