According to your own physique, decide whether you want to exercise. The altitude of 3000-4000 is not high. If you can't judge or have no experience before, prepare rhodiola for tea 10 days before hiking; If you go up to the fifth floor at a low altitude, about 15 meters, and you have obvious asthma, then you should add some exercise, such as jogging. If you usually have 1-2 hours of various sports, such as playing ball, in1week, then your basic physical fitness can support this hike; However, according to the mileage you plan to walk in a day, such as more than 35 kilometers/day, you will be very tired if you are mentally prepared, but you can basically carry it; Of course, it is better to increase the amount of exercise on weekdays.