The more temptations, the more we have self-regulatory failure. Who doesn’t know that healthy eating and exercise have massive dividends? But when temptation’s in our way, it’s difficult to say no. The brain isn’t designed to deal with perpetual temptation, yet that’s the world we live in. Willpower is an exhaustible resource, though you can renew it through rest. When you say no all the time, it means you have less willpower for the next no. Use physical cues. Would you choose not to exercise if you were in front of the gym? You’ve increased your chances massively when you have that cue. Ideas don’t have a lot of motivational power. To set a goal, break it down into tangible pieces.