Push-ups: 50 in each group, do 3 to 8 groups, with an interval of about 60 seconds in each group, and rest every other day. Do three groups at first, because it is not easy to overwork at once, and then gradually increase the number of groups, and then increase the number of each group; Don't be too hasty when you do it, and the standard can make an effect. Push-ups can not only exercise the chest muscles and arms, but also improve the lines of the back; It shouldn't be difficult for your body shape, but it's important to stick to it and don't strain your muscles too much.
Chest expander: there are thick and thin ones on the market. Anyway, if you think you can pull 20+ pieces at a time, use this handle first. Pectoralis major is the easiest muscle to exercise, and it will have obvious effect if you persist for about half a year. The exercise method is also grouped, with 25 in each group and 3 to 8 groups, with an interval of about 60 seconds in each group and a rest every other day. The operation method is the same as above.
There are many ways, because there are many fitness equipment on the market, and in my opinion, you are the kind of person who is not short of money, so it is basically enough to ask the seller which equipment to choose. In fact, the key is to rest in groups every other day, so that every exercise can keep the muscles in good condition, and the time of each exercise is about 30 minutes. As long as you stick to it, I'm sure your muscle lines will be improved.