You can teabag all you want, but then your options for JF practice are to go into Training and do it for hours, or skip it and suck at JFs. Whenever I win a round I try to rattle off 4-5 iagA's. That's about 12 per win. I have 7000 wins in Ranked on PSN. Meaning I've practiced close to 100,000 iagAs without spending any time in Training doing it.