It is well known that the longest living humans in the world usually live areas where there is a good diet and up and down walking. As you age you really don't loose your up. You can always stop rest and eventually you will get up there. Down is another matter. Unfortunately as we age we loose our down...
Climbing Stairs Is GOOD! Down is a bugger...
From Net...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)
Last edited by zandoval; 02-16-26 at 12:41 PM.