Vital Khai Male Enhancement Lack of exercise can make you body fat and overweight resulting in poor blood flow. Good blood circulation in your body and to the penis is the most important pre-requisite for getting hard and rigid erection. So , if you want to get rock solid erections, placed on your running sneakers and come out for a good daily jog or perhaps walk. Also you can try lifting weights. As a matter of fact, strength training happens to be the most effective way of increasing both blood flow and testosterone secretion in your body. A testosterone boost is ideal for your libido and also erections.