Halpern et al. ended up demonstrating the importance of loss aversion in two different ways. The more obvious is that smokers are far more likely to quit if they stand to lose money if they fail. The more subtle is that the very prospect of incurring losses makes people far less willing to enter a smoking-cessation program. Despite the greater comparative effectiveness of the deposit program, the reward program is likely to be more successful, because far more people will sign up for it.

Mental contrasting is essentially contrasting your happy, dream goal with your current reality, emphasizing the need for action, while implementation intentions are "if-then" statements about how you will deal with obstacles. The link goes to a journal article in which this combined technique was used to help women become more physically active, and the effect was sustained over months.

Great example of sales/marketing methods to learn from

Salter Mitchell

In general, “you’re 10 to 15 times as likely to buy something your friends bought because you have the same inherent preferences, and twice as likely because your friends influenced you,” Aral says. However, the level of peer influence varies by how connected the people are— fellow alumni exert more influence over one another than neighbors—and whether or not the message is personal.

Incentivizing positive behavior change

"Perhaps the most powerful influence on human behaviour is other people."