How to stay sharp.

[Sunna]

most of us as kids played hide and seek ,teaching skills like creeping up on somebody,moving around quietly and unseen, hideing and finding people skills hearing seeing ect.
as some of us got older maybe scrumping getting in /out without being seen getting over walls with glass on topor fences with barbed wire with a big bag of plums , and even older things wich may of led to a chase buy police .

as we get older how can you keep these skills and stay sharp...?