Originally Posted by
BurnHard
This is purely IMHO based on things I've read here and there and personal experience... MACHINES = BAD, *exactly* for the reasons you mentioned:
You "exceed" a certain level by strengthening a specific 'large' muscle (i.e. bis, tris, chest, quads maybe) without strengthening any of the supporting muscles because the movement is isolated and mostly supported by the machine. You end up strengthening this one specific muscle beyond what your ligaments & supportive muscles can handle which in turn leads to damage to the joint, exactly the opposite of what you would expect/were hoping for. By limiting the range of motion you help shorten the muscle causing imbalances and chronic tension/compression which leads to further problems/inflammation/stiffness. IMHO, you're MUCH better off doing free weight, olympic lifts, and power lifts, starting off with light weights & learning good form, rather than working on machines.
Plus, hot chicks dig sweaty grunting men clean & jerking 225lbs ;)