It was normal when I first went to the gym, because my muscles didn't work hard at high frequency and were suddenly stimulated with such great intensity. I can't adapt. The first time I went to the gym, my arm ached the next day, and I couldn't stand up the next day after practicing my legs. This situation will be fine in a few days, and the next day after the next exercise will not be so uncomfortable. Pay attention to the next exercise, warm up before practice, and slowly add up the sports equipment from a small weight. Pay attention to stretching after practice.