Start Stretching is a free iOS app that I like. I’ve used it off and on for the past five years.
You can use it to help improve your flexibility. Hold each stretch for 30 seconds.
The routine only takes a few minutes. It is the easiest, most helpful introduction to stretching that I’ve found.
Overview: All Stretches in the App
My Favorite Stretches
Download: Try It Yourself
Download Start Stretching on iTunes.
As of November 2020, it is still a free app. Sometimes there are ads.
I do not have any affiliation with the author or company. It is just a legit cool app I’ve used a lot.
What’s a good or similar Android app for stretching? Email me if you find one and I’ll add it to this page.