Pain and Pleasure

I feel anything that we want to achieve depends on what we associate pain and pleasure with. What do you do to get pleasure, to feel good?

Let's take an example, there is a group of people who want to achieve health and weight loss but the success of that will depend on what they think pain or pleasure is. Some of them will say 'to feel good I watch TV, I eat, drink alcohol, go to parties and for some, the very same things would be painful, they will say 'to feel good we go to the gym, hiking, biking, do social service, we create, we learn, dance, sing...'.

Not hard to figure out who amongst them will lose weight and achieve health easily so I guess the easy way to achieve goals is how to take the steps to achieve things pleasurable.