First exercise. As you urinate, repeatedly squeeze the muscles that stop the flow of urine. At first you may only be able to stop the flow for a second or two, but, keep at it until you can stop the flow as long as you want. Then allow the flow to start again, after it has started, stop it again. Each time try to stop it as forcefully as you can. You will want to repeat this procedure as many times as possible throughout the day. This will help to strengthen the muscles involved in ejaculating, making your ejaculations much more forceful. You will also find that when erect performing this squeezing will cause your penis to jerk upwards (this can be pleasing to your partner). Finally this will help maintain a hard erection by limiting the out flow of blood from the penis during arousal.

Second exercise. While maintaining an erection place some weight on the end of your penis. In the beginning it may be a towel hung from your penis. You may want to use heavier weights as your muscles controlling your penis become stronger. You can tie a slip not in a shoe string, loop it around the head of your penis, and tie a weight to the other end. The objective here is to gain control over the movement of your penis. Try to make your penis stand higher, and move from side to side. Again at first there may be little movement but with practice you can get a fair amount of movement and control. Try to vary the amount of time you keep your penis in its altered position. This will again provide you with a stronger erection, more control over it and will help to limit the out flow of blood during an erection.

Third exercise. This can be done any time anywhere, though I would start in front of a mirror