similar

to body building. If you cannot achieve an erection for several hours after a vigorous milking session, do not worry because this is quite normal. Your erectile tissue is just extremely tired, and will recover shortly. Remember to keep your hands to the side of your penis, and your thumb over the top and your index finger under while you grip your penis to perform the milking exercise.

After your jelq session, perform another "hot wrap" with a wash cloth to stimulate your penis and keep blood held within.