FITI/Fitness center & Exercise/H??ng d?n t?p gymnasium/Các bài t?p thon b?ng cho nh?ng ng??i m?i b?t ??uYour browser isn’t supported any more. Update it to have the greatest YouTube expertise and our latest capabilities. Learn more– Hít th? sâu b?ng b?ng và th? ra t? t? b?ng m?i, l?p l?i 15-20 nh?p r?i th? nh? nhàng bình th??ng tr??c khi