Do rewards or paying myself help me stick to exercise?

The question has actually been tested in controlled trials. In 2013 Mitchell and colleagues pooled eleven randomised studies with more than 1,400 participants and found that financial rewards increased exercise attendance for programmes lasting up to six months. Eight of the eleven pointed the same way, most clearly among people who were sedentary to begin with. But the evidence for what happens over the longer term was thin.

A larger review in 2020 gathered 23 randomised trials with more than 6,000 participants. Even modest rewards, on average around $1.40 a day, raised step counts by roughly 600 a day while the reward was in place. The surprise was that part of the effect lingered afterwards: in nine of twelve studies with follow-up, step counts were still about 500 higher once the money had stopped. The picture was uneven, though. Counted study by study, only four of eighteen showed a lasting gain. The authors' conclusion was cautious: a short 'dose' of reward may help a habit along, but it is not guaranteed.

There is also a catch worth knowing. Deci and colleagues reviewed over a hundred experiments on how external rewards affect inner drive, and found that tangible, promised rewards can instead reduce the motivation to do something you would otherwise have done for its own sake. Paying yourself works best for something you don't yet do, and less well for something you already enjoy. The reward should not become the whole reason, or it risks taking the desire with it when it disappears.

A reward feels like a shortcut: if only the carrot is good enough, the willpower will sort itself out. The fact that it partly works makes the idea hard to let go of, because we remember the days when the points or the money got us off the sofa, not the months afterwards when the effect faded. Fitness apps and watches build their whole design around this. Points, badges and unbroken streaks are cheap to code and make the product feel motivating, while the uncomfortable question, does it hold once the reward is gone, is rarely asked in the marketing. Whoever sells the carrot benefits from you believing it is the answer.

Use rewards as a starter, not the engine. They help most when you are building a habit from scratch, so tie a small reward to showing up rather than to how the session went. Phase it out as the routine settles, and let the habit and your own reason take over. Avoid paying yourself for something you already enjoy, where the reward does more harm than good. And keep the step small enough to manage on a sluggish day, because it is the repetition that holds, not the carrot.