Habits and Hammy PT

I've been considering my habit-formation effort in a few ways:

• I will have periods of great success, and then some "corrections" in how well my efforts work. As long as the highs get higher, and then the corresponding lows get higher, I'm doing well overall.
• Mindset really is the key. Example: I have made a habit of doing a pretty serious workout every day with P90x. On days that I'm particularly lazy, I find some "reason" to give myself permission to skip out on what I know I should do. Lately, I haven't been doing P90X, and I run 30 minutes instead. Previously on lazy days, I would just skip it altogether. I'm a a "low" point in this habit, but this low is higher than it used to be. 
• I don't really know the "perfect" number of habits to attempt to develop, but nature does. I shouldn't be disappointed if some effort falls by the wayside, when I'm doing very well with others. This is my mind naturally bearing all the effort it can. Instead of considering those dropped efforts as failures, I can consider them as my body and mind finding equilibrium.