Your resources, time, and money are valuable.  You should not be wasting them on stretching.  The only reason to “stretch” is if you enjoy it as an activity.  That’s it.  There is no evidence that stretching prevents injury.  “Tightness” isn’t the thing that causes pain.  Below is an ever-expanding list of resources discussing why.

The granddaddy of them all:https://www.painscience.com/articles/stretching.php

A good paper on Stretching:  http://www.aptei.ca/wp-content/uploads/Stretching-Paper-2015.pdf?fbclid=IwAR16L2Y0HQAAOFElsD7KeQ7ZCRK2NXt4aRE_eTQWsvr0-t7HA0TXU4mbeT8

A 2 part article written by Greg Mack and Jay Weitzner:

My Muscle Is Tight – Part 1

My Muscle Is Tight Part 2

A great article from BreakingMuscle.com:http://breakingmuscle.com/fitness/stretching-doesnt-work-the-way-you-think-it-does

Bad stretching take from a good doctor:  https://symmetryexerciseclinic.com/bad_stretching_take_from_a_good_doctor/

Why Do Muscles Feel Tight?:  https://www.bettermovement.org/blog/2015/why-do-muscles-feel-tight?fbclid=IwAR2BA28Ay-UwEzSg0BqZyTwiWdRqp6ZBUu0zs0_OPCprLDPCj-qMyaR2WCs

The Case for Retiring Flexibility as a Major Component of Physical Fitness:  https://pubmed.ncbi.nlm.nih.gov/31845202/?fbclid=IwAR2mQpICfAfUvg7NcFG5gsXQ1jrPaBX2NpII7Kx4R-V75KBb9GQ_Cidb9-c

The Effectiveness of Post-exercise Stretching in Short-Term and Delayed Recovery of Strength, Range of Motion and Delayed Onset Muscle Soreness: A Systematic Review and Meta-Analysis of Randomized Controlled Trials: https://www.frontiersin.org/articles/10.3389/fphys.2021.677581/full?fbclid=IwAR2k3FE6ZUwkrPc6clrbBBgbUkMjQuia1_Re81qUNh4u-XMA2AaAyHzJcN4