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"the apex of the crease in the shorts (B). The B-side of the plane formed by these two points must drop below parallel with the ground."
"The femurs are parallel to the feet, feet are flat on the ground at the correct angle, hips are back, knees are just a little forward of the toes, and the back is at an angle that will place the bar over the middle of the foot, about 45 degrees."
So depends on which body part you're talking about.
I have read somewhere that ATG squats are dangerous. (ATG - ass to grass). I’ll stick with the safer option - parallel for me.
Out of interest, try a squat - thighs parallel with no weight - prisoner squat etc. Hold for 10 secs. Use a mirror to ensure thighs are parallel.
This is a part of a Bikram Yoga pose. The yoga pose has arms out in front - parallel to the floor. I find it relatively easy compared to the other poses but parallel thighs is a must.