Reasonable fitness can promote the height growth of 17-year-old teenagers. There are many fitness contents to choose from. I think you mean the kind of high-intensity equipment training, which belongs to the category of bodybuilding. If so, twice a week is a little less. Can't play the role of sculpting muscles. If time is tight, it is best to choose simple actions such as running, skipping rope and single parallel bars. If you have dumbbells or you can buy a pair of dumbbells to exercise at home, you can avoid the time on the way to the gym, so you can train more than three times a week, which is very useful for sculpting muscles.