I’ve read that it takes a few weeks to form a new habit. For me, exercise is eternally a new habit because I often tend to go in hard for an intensely short period of time with something new, before losing enthusiasm and forgetting about it. Oops. I’m always on the look out for something that will hold my attention and motivate me when I am feeling lazy and tired. I love my treadmill (have I told you enough yet?) but I know that in order to sustain my new, healthier exercise habits, I need to mix things up sometimes. It’s great to have that real thrill that you’re trying…