How many fingers of the rectus abdominis muscle can do the curling exercise

Well, in fact, we all found out, now the square dance more and more get rid of the situation of twisting rice-planting song, but should be more and more specialized, especially roll abdominal, belongs to the current trend of the more hot a project, but it does not need special rectus abdominis muscle can be done, but as long as you can skillfully do more than a few times, and slowly on the success of the