[a_c_s]

The biggest reason people loose muscle mass as they age is due to lack of use, so a built environment that encourages walking is going to help keep people in shape to walk as they age.

[JumpCrisscross]

> a built environment that encourages walking is going to help keep people in shape to walk as they age

It's the reason New Yorkers live longer [1].

[1] https://www.nytimes.com/interactive/2015/04/29/health/life-e...