when doing squats, you cannot keep your torso perpendicular to the ground because your center of mass would be too far back and you'd immediately fall backwards. you HAVE to have the barbell over your feet, which means you have to learn forward. that is, unless you're squatting 20 lbs. why do i have a feeling some people here are obese monday-morning quarterbacks who haven't done a single squat ever?
Also, imo far too many people squat too low with far too much weight That will catch up with them when they are 50 Instead, they should focus on hip action in lieu of knee action and push out the lower back as much as possible and hold the position for a few seconds - this is how I squat and it makes my quads scream! Or you can do 1-leg squats -- my speciality
Finally, a couple of people who know what they're talking about. But I don't know about the one-legged squats, though. If you go all out, you may be risking an abdominal hernia. Some people, about 10% I think, have a slightly larger space than average in the center column between their abs. This makes them susceptible to such hernias, particularly when the movement is unbalanced (i.e., one leg). So, personally, I wouldn't mess with that movement. Further, being as lazy as I am, I prefer to work both legs (or arms) simultaneously rather than spend twice as much time to get the job done.
Sheesh, I can barely pull myself out of bed in the morning and waddle to the monitors these days, but My wife just got super serious about body building and now I'm up early to run (after a couple Marlboro's of course) and it's a hard road back up-hill for me, total fun & so great! http://www.onequant.com/nbates.jpg
He suggests 9-12 sets per body part per workout for most body parts, and less for a few others. If that's too much for you in your 20s, your a fcking pussy.
As I recall, his book, which I bought over 20 years ago, outlined some routines that called for about 20 sets for some muscle groups and possibly more. I was doing about 9-12 sets per muscle group into my mid 40s. I have since dialed it down a bit. In their heyday, Arnold and his contemporaries were doing too many sets if you went by what was written in some of the magazines and books in those days.