The advice my grandfather gave me most frequently was "keep your back straight." 

My initial reaction: "that's kind of strange and unexpected." 

But then I thought about it some more… there are a few ways to think about posture. 

There's having an upright posture in terms of how you communicate — the kind that speaks with sincerity and honesty. 

Then there's having an upright posture in terms of character — the kind that favors doing the right thing, being helpful and kind to others. 

And then finally, there's the most conventional sense of an upright posture which is… literally having a straightened back. 

In hindsight, his message was profoundly wise and straightforward:

Be a good human… and don't slouch. 🙂