Exercise

I have never taken any exercise except sleeping and resting.

~ Mark Twain

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Exercising can be difficult. Sometimes it's hard to fit it into one's routine.  Or to find ways of exercising which don't become redundant or tiresome over time.  There are lots of excuses and obstacles (real or perceived).

I think for me, though, much more challenging than doing physical exercise is exercising restraint.  I'm way worse at that.  You can pretty much ask everyone.