When I start exercising and tracking how many calories I burn, I realize how hard it is to outrun your diet. Thinking, "This cookie would cost me 35 minutes on the treadmill," is a huge deterrent.
When I stop working out, I quickly forget what calories actually cost.
Totally this. I've recently embarked on a weight loss/fitness journey (coming up on 50 rotations around the sun) and I find it incredibly helpful to think of the 250 calorie chocolate bar as roughly 25 minutes on the treadmill.