???? beginners ?? ?? ????? thrilling ???????? ????? ?????? ????? ???????? ?? ???? ?????? ?????? ???. ?? ??????? ?? ????? safe ? ??????? qualified? ???? ??????? ????????? basic ????????? ??? ????? ?? ?? ????? ??? ??????. ??? ?????? ???? ???? ?????? ???? ?? ???? technique ????????? safety ? tips valua