By John Grace

Contributing Columnist

As my parents and my wife’s parents rolled into their 90s, we realized we might have been part of the problem.

We encouraged them to “sit and relax,” thinking we were doing them a favor. Or maybe we were just selfish — too afraid they would fall, break a hip, and wind up with the dreaded “death by pneumonia two months later” headline on our watch.

But neuroscience has a different message: sitting is the new smoking, and if you want to keep your marbles while blowing out 100 candles, you’d better move those hips. One study has shown that just 10 minutes of daily exercise can improve mental performance. Ten minutes!

That’s less time than you spend yelling at the TV news or trying to figure out why your iPhone won’t update. And the more you move (up t

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