Exercise theory.

I think there are 2 schools of thought. Not counting people who avoid exercise.

1st group are all about goals. Exercise is intensive, because you are trying to lose weight, or run a marathon, or something. You do hard exercise because you want results. I sometimes try this way but I can't sustain it for long because it takes a lot of willpower.

2nd group are about being generally active. I can easily say that I am an active person, because I walk to work and stuff, do a little bit of swimming, carry my groceries home from the shops, etc etc. Being active is good for your health, keeps you in good shape if you eat lightly, and I find it is easily sustainable— you just don't get peak fitness or any other measurable results.