My son four weeks and a half contact martial arts a few days by the coach with a stick hit what to do!

It is normal, not to mention martial arts, even we learn taekwondo, girls, is the same will be beaten, remember when I was a child, there is a class, left and right legs always can not distinguish how to out of the leg, the coach taught me many times, and then did not, the coach let me push up on the ground, take a small stick to the buttocks hit three times, really especially painful, but the coach is also very gentle, hold me up, heartbreaking and I explain, tell me how to do, hit the Pinzig, the same, hands are also beaten, quite normal ah, martial arts is so", to sharpen their own", and so on. How to do, hit the same Pinzheng, hands also beaten, quite normal ah, martial arts is so", to hone their own