Stretch for muscle tightness is most often the wrong decision.

Especially with an injury.

There are 4 basic reason you are tight so learn the difference and treat yourself better!

short vs long muscles (Pulled hamstring and Tight IT band /sciatica)

spasm at the spine (Hurts to get out of bed or take a deep breath)

electrolytes (charlie horses and calf cramps)

day after the gym

these all each have different responses and THEREFORE different treatments.