I am an old guy (age 62), yet I am a new lifter. I started working out in August of 2006. I've been reading the Hypertrophic Specific forum for many months. I've gotten a great deal of help here. Thanks to all of you who contribute. I've been following an HST program and am just finishing my second week of fives (kicked my butt...!!). Over a period of just over a month or so I've gone from 133 lbs to 139 lbs and am noticeably fuller. I'm not a big guy (5' 3", so six pounds is a significant gain. Anyhow (sorry to go on and on...), I have a question about straining or pulling muscles. Somewhere on this site I think I've read about sensing that you're about to injure yourself. I was wondering what the warning signs of an impending injury might be. A week ago I was doing my squats with a bit over my bodyweight on the bar (my first big-boy squats...!). As I was in my third set of fives I noticed a slight pain running down the side of my thigh to just above the knee. It wasn't serious -- it felt about like second-day DOMS -- except it was only on my third set! I was concerned if this might be an indication that I am doing something wrong, or if perhaps I am heading for an injury.