Stadion's Sports and Martial Arts Training Discussion

Sorry, but what is the difference between static stretching and isometric/pnf stretching?

Hi all, my name is Rudolf, im an italian boy, and i practise taekwondo since four years, i would ask you a question about side split, i do everyday stretching: 5 side splits and 4 front splits, my flexibility on front split improves, but on side split doesn't. How can I do to improve my side split f...