DON'T FLEX YOUR BACK‼️ When muscles contract they shorten and get smaller. In the back not only do contracted muscles appear

DON'T FLEX YOUR BACK‼️ When muscles contract they shorten and get smaller.  In the back not only do contracted muscles appear

Exercise Selection for Better Muscle Growth, by Jason Galea, STCfit

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DON'T FLEX YOUR BACK‼️ When muscles contract they shorten and get