Jelqs are the core penis-building exercise that is also essential for warmups. They are also a very effective girth-enhancing exercise, which very effectively facilitates gains from other girth-building routines (SSs, ulis, squeezes, pumping, clamping). But before ones gets to the advanced girth routines, it is necessary to make your penis tissues very strong and resilient to pressure. Jelqs and stretches do the job.