My plank-a-day plans got disrupted when we started bathroom renovations. So I am going to start again and this time do it the recommended way.
I think a Thursday would be a good day to start, so today it's 1 x 1 minute, building up to 4 x 1:00 by Sunday, and resetting at 1 x 1:15 next Thursday.
It is good to have a plan; the trick is to stick to it come hell, high water, new bathrooms, or unexpected visitors.