I meditate while walking my dogs or taking a shower. Unless you are trying to achieve the title of Zen Grandmaster (which you probably are not) there is no need to sit still while doing so.
I think you are on to something here, but there is a difference between doing something relaxing and "meditating". I'm most relaxed while sitting on the pot and I get my best insights while taking a shower, but during neither of those am I meditating (in the zen sense).
A Zen Grandmaster can probably meditate while rollerblading through NYC and simultaneously debugging a kernel driver. For beginners, it helps to sit relatively still with eyes closed (or eyes focused on eg a candle, tree, waterfall etc. but not darting about), to chant or use beads to count breaths, etc.
Dunno. I've found purposefully sitting still is much more effective than walking dogs or taking a shower, during which your mind may calm down, but may very well not as well.
A Zen Grandmaster can probably meditate while rollerblading through NYC and simultaneously debugging a kernel driver. For beginners, it helps to sit relatively still with eyes closed (or eyes focused on eg a candle, tree, waterfall etc. but not darting about), to chant or use beads to count breaths, etc.