If you're curious about how multiple regression can be applied, complete a Life Expectancy Calculator (takes ~15 minutes). This will use a regression equation (behind the scenes) to predict how long you will live.
What could you do to improve your life expectancy? (probably change your behaviour on some of the key predictors)
What do you estimate the unstandardised regression coefficients to be for each of the variables the calculator recommends you could change in order to increase your life expectancy?