Apart from silly yet obvious and triumphant ones (e.g., shower regularly) … mine would be spending 1–3 hours every day on the rowing machine. (I have a Concept 2.)<p>It's not lost on me that this falls into the similarly obvious category of "exercise regularly", but the compounding effects are really astounding: urge to eat better; more regular and deeper sleep; better stamina; better performance in all other athletic activities; ideal weight and body composition; enhanced self-esteem; equal time spent listening to quality books; faster completion of work when I'm not on the rower; self-discipline that bleeds over into other life areas; time to meditate on problems during the row; etc.<p>An important principle I've taken away from stumbling upon this principle of my own body/mind's operation is that sometimes I have to spend what seems to be an unreasonable amount of time/effort on something to get results. But when I hit a certain (dare I say) tipping point, it's as if the floodgates of awesomeness suddenly open up.<p>For what it's worth, I have several young children and run my own law practice — so it's doable, despite seeming otherwise. I haven't always been perfect, but I've found, as I think others would, that the hours on the rower are an investment that seem to create more time than they require.