#4) Bouncy stretches
Bouncing while stretching, when done too vigorously, can lead to a pulled muscle. This ballistic motion can trigger the muscle to tighten to protect itself, defeating the purpose of the stretch. Bouncing while stretching can also cause you to stretch too deeply.
Instead of bouncing, gradually elongate into the stretch. Hold the stretch for 10 to 15 seconds, release and repeat. You may also practice dynamic stretching, moving through your full range of motion, rather than bouncing.