I've always wondered about that idea that habits form in 21 days (or 90 days or whatever). What does it mean exactly?
I think it's supposed to mean that it gets easier to engage in the habit -- that it becomes automatic. And I just don't know about that. I've been exercising regularly for about 2 years and it's still something I have to make myself do. Some days, I do find it easier, than I did 2 years ago. And it is easier to think of reasons why it's good for me. And I have a sort of "body memory" of my body feeling better after exercise. So, I feel like there's something to the idea of habits.
But I also think I could relatively easily slip out of this good habit if I'm not really careful. I have 39 years of sedentary behavior that a big part of me really wants to go back to. I wonder what the role of "habit" is compared to my commitment to this process...


I did the
for 1/2 hour. I got pretty sweaty.... 


. Anyways, it's much better if I take a dance class or even just walk home from work. I agree with the others, you just need to find the exercise for you.