First of all, can a muscle become hyooge and incredibly strong by only doing isometrics? And always in the exact same part of the ROM?
I noticed that bridging is already building something on my back...all the deads I did didn't do to much (well, at least not with strict form- super-arched back). How am I supposed to build a strong back then? I don't have access to a reverse hyper. And I don't know if weighted bridging is that useful...Altough I guess it is an option(my back gets sore, and my neck is now thicker).
btw, how did everyone build their backs? I just can't find anything, and I think I'll develop an imbalance between erectors and abs (I work on the L-sit(well, time, because I can only hold it for a few seconds). I should get the lever in a few months...
Now, I see people doing deads with full ROM on a x ing box. This involves rounding of the back. What am I supposed to understand? Please help me here.