I've yet to figure out how to do a lat pull-down with free-weights. You can use free-weights to do a shoulder press pushing the weights above your head, but unless you hang upside down, how else can you generate a pulling-down?
Okay, some machines are obviously different. A lat pull with a cable and pulley is not a fixed plane.
Obviously the best exercise for verticle pulling though is a chin-up. Most people can't do them, so Lat pull is a decent alternative.
I found your quote "Your body does not move in fixed planes" interesting. Perhaps a better representation would be body parts, therefore your assumption would be false. The biceps curl is a simple flexion on the saggital plane, same goes with extension of the quadriceps (although some medial rotation).
I was pretty specific when I said "body" versus "body parts". I realize that some joints track in a "fixed" plane (sorta), but your individual parts were never intended to work alone. They aren't soloists, but members of a choir.
When you throw or climb or run, you aren't just flexing and extending at the knee. You're flexing, extending, and twisting simulateously at multiple joints.
What would you say about messing up strength imbalances of your thigh for example. Wouldnt machines be great for this, if anything i would have critisized the stress on the actuall knee joint itself - not proproception or imbalances.
Absolutely not! When the ACL goes it isn't because it needed to be stronger. When you have a power leak of some sort, it expresses itself as stress, usually where you are compensating.
For example, when someone has a back injury, the typical medical diagnosis is that "the back is weak and it needs to be strengthened." This is actually counter-intuitive. If the back broke down it is actually generally caused because of a weakness lower in the kinetic chain, like hams or glutes that don't fire, and the back, being STRONGER, picks up the slack. The problem with this is it is an ineffeicient sequence, and it is not repeatable in the long term. It may take years, but eventually the back, which is not designed to decelerate those kinds of forces, breaks down and injury occurs.
So the actual fix is not to do back extensions on a fixed plane machine... You are just throwing gasoline on the fire. The fix is to strengthen the glutes or hams or lower leg or whatever (you would be surprised to learn how many back injuries are related to big toe problems).
If you don't correct what caused the injury, it will just keep coming back time after time after time. I don't break the body down into "parts"... I focus on movement patterns. The body doesn't learn "movement patterns" without actually doing them. Use of things like bands can actually expidite your body's ability to adapt to more efficient deceleration.
(JP...is it that time of month or what??? dayum!)
Heh... Sorry.
Those of you who know me well in this forum know that I am a little passionate and that I speak my mind. I don't speak up if I don't know what the hell I'm talking about though.