The “rich habit” of aerobic exercise, for example, is a good “keystone habit.” The Indiana researchers found in their study that those who exercised aerobically, by virtue of the transfer effect, also forged the habit of eating healthier food. This had the effect of improving overall health of the exercisers in their study.
The “poor habit” of sitting on the couch and watching TV can be a bad thing, however, leading you to other “poor habits” such as eating junk food.
Meanwhile, the “rich habit” of saving 10 percent or more of your income can lead to other “rich habits,” such as using coupons, buying your clothes at Goodwill stores, prudent investing, budgeting, etc.
The “poor habit” of spending more than you earn, on the other hand, can lead to other “poor habits,” such as overusing credit cards or borrowing money from banks, family and friends. The stress associated with struggling to pay your bills can also lead to other “poor habits” like eating unhealthy comfort food, drinking alcohol or taking drugs to relieve the stress.