I don't have the wii active, although I think you've just convinced me Astro!

My only bit of advice, don't use the scales on the board. Use your own. Apparently, I weighed 1kg less before I started an hour long jog around my loungeroom. I did the run around (at midnight mind you) and checked the weight again, and it told me I'd gained a full kilo. I find the weigh-ins to be way off with my scales at home. I lost 3kgs and could feel it in my clothes, and the wii fit again said I'd gained. Great morale booster!