Willpower is not something you either have or you don’t.

Sure, some people may be more self-disciplined than you. Some people may be better at resisting temptation than you. But that’s probably not because they were born with some certain special something inside them–instead, they’ve found ways to store up their willpower and use it when it really matters.

They have remarkable willpower not because they have more of it, but because they’ve learned how to best use what they have.

Here’s how you can, too:

1. Eliminate as many choices as possible. We all have a finite store of mental energy for exercising self-control.

The more choices we make during the day, the harder each one is on our brain–and the more we start to look for shortcuts. (Call it the “Oh, screw it,” syndrome.) Then we get impulsive. Then we get reckless. Then we make decisions we know we shouldn’t make, but it’s as if we can’t help ourselves.

In fact, we can’t help ourselves: We’ve run out of the mental energy we need to make smart choices.

That’s why the fewer choices we have to make, the smarter choices we can make when we do need to make a decision.

Say you want to drink more water and less soda. Easy. Keep three water bottles on your desk at all times. Then you won’t need to go to the refrigerator and need to make a choice.

Or say you struggle to keep from constantly checking your email. Easy. Turn off all your alerts. Or shut down your email and open it only once an hour. Or take your mail program off your desktop and keep it on a laptop across the room. Make it hard to check–then you’re more likely not to.

Or say you want to make smarter financial choices. Easy. Keep your credit card in a drawer; then you can’t make an impulse buy. Or require two sign-offs for all purchases over a certain amount; then you will have to run those decisions by someone else (which probably means you’ll think twice and won’t even bother).

Choices are the enemy of willpower. So are ease and convenience. Think of decisions that require willpower, and then take willpower totally out of the equation.

2. Make choices tonight that set up tomorrow. It’s also easier to make smart choices when a decision isn’t right in front of you. So pick easy decisions that will drain your store of willpower tomorrow, and make them tonight. Choose what you’ll wear. (Leo Widrich of Buffer found a way to make this decision incredibly easy.) Decide what you’ll have for breakfast. (Ditto for Scott Dorsey of ExactTarget.)

Decide what you’ll have for lunch–and go ahead and prepare it.

Take as many decisions off the board tonight as you can; that will allow you to conserve your mental energy for the decisions that really matter tomorrow. And while you’re at it, decide what you will do first when you get to work. Then commit to…

3. Do the hardest thing you need to do first.

You have the greatest amount of mental energy early in the morning. Science says so: In a landmark study performed by the National Academy of Sciences, parole board judges were most likely to give a favorable ruling early in the morning; just before lunch, the odds of a favorable ruling dropped to almost zero.

Should judges’ decisions have been affected by factors other than legal? Of course not–but they were. They got mentally tired. They experienced decision fatigue. The best time to make tough decisions is early in the day. The best time to do the most important things you need to do is early in the day. Decide what those things are, and plan to tackle them first thing. 

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