c gheller said:great advice madcow. I was wondering Bro with the 5x5 routine you posted you said it can be modified. Can i do leg press instead of sqauts and is ther an alternative to deadlifts i can do as i have a back injury and i cant do those. Also with the barbell rows you say arch your middle back slightly.....do you mean lean a bit forward so that your torso is roughly halfway between verticle and horizontal?
Ok - in general, you never ever want to substitute leg press for a squat, there's no comparison in the results or stimulus for growth. For the deadlift, pulling is a fundemental movement to the body (like the squat) the only real substitutes involve nearly an identical motion done dynamically (power clean/snatch, high pulls etc...). With the modified 5x5s I've posted the squating is the key so making a substitution here isn't something I'd advise in any circumstance except one - injury.
In your case, a back injury precluding you from doing the movements, I'd substitute and work around as best I could. Hopefully it's not permanent and you can go back to regular lifting. That being said, a lot of the people who claim they can't squat or deadlift are using it as an excuse or had some lame brain general practitioner tell them that. Not saying that's your situation but if I'm going to put something down in writing other people read it too and I don't want some candy ass subsituting out the bread and butter lifts and wondering why he makes no progress.
So basically, you do what you can and your focus should be on getting better and improving your back - depending upon the injury, hypers are solid rehab as well as an assortment of stretches and basic bodyweight movements you can get from your P. Therapist.
For rows - I like to be as close to parallel to the ground as possible (back at 90 degrees). Obviously we all have varying degrees of flexability, so as low as you can without rounding, keep your back flat, and your chest should be visible in the mirror (head faces forward/body follows head/back will be flat to arched/you will see your pecs some in the mirror). What you don't want is the "bodybuilder bullshit row" where they are squating like taking a crap and their torso is nearly straight up and down making the range of motion look like a little shrug. This is due to horrible core strength.