The bendy/foldy ways in which our bodies can manipulate, have a varied degree of relativity, based on the frequency of our actual personally-physical-involvement in the course of the parabolic synthesis over the course of our physical earthly perambulation.
“Dude, what the heck are you rambling on about?”
The more you stretch your muscles and tendons, the less you suffer from the nagging, achy effects of life, gravity, aging, etc.
In short, the older our skeleton becomes, the stronger our muscles need to be.
But how to accomplish such an impossible task?
Work out the kinks. If your musculature is complaining, it needs rejuvenation by way of daily toning.
Eventually you will achieve physical comfort/strength.
Thank you and Goodnight.