Advice for fitness after 40 usually highlights flexibility as a key component. Within OlderBeast philosophy, flexibility is one foundation of the “endurance, strength, flexibility and balance” goal set. (Come to think of it, those are good goals for long-term mental state, too. But that topic’s for a different day).
But as much as the flexibility goal is touted, there’s surprisingly little high-quality, standalone advice out there on stretching.
Here are three resources I think you’ll find useful, though. None is perfect. But together, they constitute a good start if you currently do little or no stretching. Or they can help you add to or refine things you already do.