Most people have at least heard of Kegel’s, exercises for women designed  to strengthen their vaginal muscles. Few realize however that there is  also a version for men. The focus is on learning to control the PC  muscle. This is the collective name given to a group of muscles that run  from the anus to the base of the penis and around. Learning to control  these muscles can be beneficial to any man, but particularly those  suffering from premature ejaculation.
Most men have a difficult time at first learning how to contract and  release their PC muscles. It is actually the same muscles that are used  to stop urination. If a man stops his stream mid-urination, those are  the PC muscles he just used. With practice, and by following a routine  such as the one covered in the Ejaculation Trainer, a man will be able  to develop a stronger PC muscle and have better control over it. It’s  not recommended that you practice using your PC muscles on your own  without the aid of some sort of manual. These aren’t muscles that are  used very frequently and often times are weak, especially in those  suffering from premature ejaculation.  There is a good chance of injuring your body if you attempt to work  with the PC muscles in an improper manner, which would make your  problems even worse. 
Probably the biggest misconception regarding the PC muscle and premature ejaculation  is how it’s used. Over and over people say it’s to be used to ‘hold in’  ejaculation. While this may help if you’re about to go over the top,  the main focus should be on how to keep it relaxed. Mastering relaxing  the PC muscle can be very beneficial to men who suffer from premature  ejaculation. During intercourse, most of a man’s body, including his PC  muscle, is tense. This tension increases sensitivity, leading to higher  states of arousal and the loss of ejaculation control. By relaxing these  muscles during intercourse, the pressure is lessened and arousal goes  down. 
By learning to control your PC muscle, you will not only be able to last  longer during intercourse, but you will more than likely be able to  orgasm multiple times. Once the PC muscle is strong enough, it will  actually be able to reduce the amount of semen that is released during  orgasm by contracting the muscle as firmly as possible. This will keep  you from climaxing completely and usually within a short period of time  you will be ready to orgasm again. This can be helpful both in regular  intercourse and in those situations where you find yourself climaxing  before you would like. If you can reduce how much you release, you can  keep your arousal level up so that you can continue on long enough to  please your partner.  
The premature ejaculation treatments Trainer covers  absolutely everything about the PC muscle. It doesn’t just say to  squeeze it like every other website or book. It focuses more on teaching  you how to keep it relaxed, and therefore prevent the PC muscle  contractions that lead to ejaculation and orgasm. This is critical  knowledge that is only covered in the premature ejaculation treatments trainer.