Here are some simple ways to exercise your stamina. First, lift the anus, shrink and put the anus, you can exercise the muscles of the anus. Two, sit-ups, sit-ups can exercise the abdominal muscles, a lot of research shows that men with strong lower abdomen have stronger control of the PC muscle, and can also use the classic action of supination knee lift to achieve better results. Th... https://www.viagra-hk.cn