Hehe, it's normal. I practiced Sanda for three years before. I went to the martial arts school for the first time and trained every day. After a week of training, my whole body aches. That week, my foot was too painful to walk, but I still had to continue training. I can't help it, so I'll just be fine. When I heard that this friend is a novice in Sanda, your pain is similar to that before, because you haven't exercised in those places for a long time. Pain is to grow muscles. Don't worry. When you feel pain, you can rub it with your hands and press it on the painful muscles. You can feel very painful and comfortable, so you can relax your muscles as a massage.