I have been using stretching exercises for more than 30 years now. Over those years, I can attest to having benefited greatly from those exercises.
I have used a series of stretching exercises numerous times after long car and plane trips and other activities that have caused stiffness in much of my body. The relief and lessening of fatigue has often been dramatic after taking just 10 or so minutes to stretch out.
I once stepped off a curb unexpectedly because I was not paying attention to what I was doing. Although my back was twisted awkwardly, good flexibility in my hips, back, and trunk saved me from experiencing a potentially serious injury.
Similarly, I have stretched my back out carefully a number of times when it has been sore and received quick and lasting relief.
By regularly stretching my calves a few years ago, I recovered from an injury to my heel that had troubled me for some time.
Through a series of stretching exercises that I have done regularly for many years after hard exercise, I have been able to limit soreness after such activity.
Regular stretching is an inexpensive and highly effective way to better your health. I highly recommend such a program.