Thanks. I just realised. I won't do either deads or good-mornings. =)) I guess someone might now tell me that considering my lack of legs and spinal erectors and mass in general I'm totally dumb (posted some pics around here). I found some gymnastic exercises that train the spinal erectors without the legs, mainly the back lever. Many thanks.
P.S.: believe me, I'll get it. Six months or a year, but I'll get it. Right now I can hapilly hold for a little more than five seconds an... ummm...isometric contraction with my elbow bent at 90 degrees with one arm (in the one arm chin-up)and control the descent even in the bottom half. I started by pretty much falling and feeling my shoulder and chest trying to rip during the negatives...now I can hapilly hold myself with one arm at the top for some time (15+seconds, I think). Yeah, I know, I have no legs. But at my 145lbs, I can pull 245 (is this considered acceptable?bw+100)