A Creature of Whim

What's the opposite of habit? I looked everywhere and couldn't find a good antonym. What I'm trying to say is I'm not a creature of habit. Repetition bores me. Which is why I keep swapping out workout plans. ALL the time!

The only thing I seem to be able to do repetitively is run. So my workout routine will always have a certain amount of running. But it helps that it's usually training for a specific goal, like a marathon.

These days, since I'm in travel-mode (Again! Still!) I've been limited yet again to workouts that are portable and equipment-free.

Here's what I've been doing: 3 days a week, I run. Twice, I run for about 4 miles, then on the weekend I do a longer run (I'm currently working my way back up again, so I just did 7 miles this past sunday and plan to do 8 or 9 this coming sunday). I keep meaning to add a 20 minute interval run, but I've yet to work that in. Maybe today will be the day...

In addition to that, I've been intermittently (about 3 times a week) doing the Nike Yoga for Runners, which I bought on iTunes, by Kimberly Fowler - a 15-20 minute yoga stretching routine.

I usually also do a core workout: P90X Core Synergistics or Yogamazing podcast for example. An upper body workout, often also from Yogamazing. And then I through in P90X Cardio X or Kenpo X for good measure. Other than the running, I usually let my mood, work schedule and the way my body's feeling dictate what I'll do that day. And I've been pretty good at keeping it to 6 workout days a week.

So, any of you folks out there the "non-habit" types? How do you switch up your routine?
Or if you're doing P90X or P90X+, do you ever stray and create your own workout combo? What do you like to do?