Probably THE most common mistake I see when people stretch and lift weights is that they’re usually out of proper form and posture, which often leads to not properly stretching or strengthening the muscles that the exercise intended. Not only are they ‘perfecting their faults’ and developing poor posture but being ‘out of true’ can over time, lead to injuries.
Along these lines, I somewhat disagree with the adage that “Practice Makes Perfect”’ and feel that a more accurate phrase is “PERFECT Practice Makes Perfect”!
For this reason, I highly encourage people to use Props as I’m demonstrating here; ie. The Slant Board and PostureFit Bar, which will surely Get you STRAIGHT while you STRENGTHEN!