I don't know if Aikido counts as grappling or fencing (without hands) art, but for aikidokas out there (who are a minority here), I have some questions: 1. My sensei insists that in performing a technique, I should relax my legs and shoulders, but the hard one is using my center (hara). How is this done? Do I contract my diaphragm? 2. I performed a technique on my uke and he intentionally resisted. I leaned on him to make him fall yet he didn't. The sensei also said that I'm not using my body but I'm merely leaning to him. I don't get it. Is using my body or center != using my weight? My sensei sort of beats around the bush when he answered the question. He said that'll take years. Anyway, that's all. Thanks.