Adding option to weigh yourself

I would love to be able to weigh myself before I work out each day, like you can with Wii Fit. I don't think that you can do that with Sports Active, can you? It would be very handy!|||I use my Wii Fit to weigh, it's OK but my weight has gone up and my inches gone down. and the Wii Fit wants to know whats wrong? There's not a selection for muscle gain. :)