I know how you feel...Only stretch after running and at toning classes.
I have been very inflexible my whole life.
Basically its just age Sunny. The spirit is willing but the flesh is weak.
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I started Pilates not so I could run a marathon or lift my own weight.
Rather to retain my flexibility for the years ahead.
Unfortunately my old man sat in a chair for the better part of his last two decades. And lost quality of life.
Pilates has worked for me so I’m a convert.
You’re time poor with your running commitments (plus life), but if you ever get an opportunity I’d strongly recommend you look at it.
BUT: have private classes. That one on one is incredibly important. Pilates at it’s best revolves around quite minor muscle movement. Correctly done, the benefits are great.