I don't know if there is a scientific way, but I can say what works for me. To start, I essentially resign myself to doing whatever habit I want to build, makin

I don't know if there is a scientific way, but I can say what works for me. To start, I essentially resign myself to doing whatever habit I want to build, making it in my mind so I have no choice so there's no getting out of it. Then I just do it, rain or shine, no matter what, which can be super difficult. After a while, it becomes easier. One example is running. I just told myself that I needed to run for one hour every weekday at 6am. Extremely difficult as I normally sleep in until 7, but I just told myself I have no choice. So I started getting out of bed at 6 and running until 7. After a couple weeks it got easier, after a month I did it without much thought. After about two months, I feel weird if I don't do it and miss it. I am also interested in whether there's more to building a habit than this.