NEVER LOCK OUT

97. NEVER LOCK OUT Although they are marvels of engineering, human joints can only take so much abuse. You should never lock out completely on any exercise (with the possible exception of triceps exercises). Locking out places tremendous stress on the joints, particularly the soft tissues that surround the joints. If locking out can be compared to making a 180 degree angle between two lines, then stop at about 170 to 175 degrees.