I went ahead and bumped up to 45 seconds last night, because I didn't want to arbitrarily stick to the schedule when I knew I could do more. 45 was surprisingly harder than 30, although maybe that's only because I was still subtly recovering from the first night. I have to say, though, I greatly prefer the planking position to sit ups, which have always hurt my back and neck. (Probably because I'm doing them with poor form, but regardless, I like "holding" exercises better than "doing" exercises.)
My kids saw me and wanted to try it--they did two rounds, Minifobette for 15 seconds each time, and Minifob for 20. I was pretty impressed.
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