does anyone use Withings? I downloaded it today as a suggestion from a work colleague, it tracks your steps and measure heart rate and blood pressure and so far is pretty good. If you're obsessed with numbers like I am then it's a great app and I highly recommend it - even just to check your heart rate through the camera!
however, my colleague has managed to track her steps from before she downloaded the app - for anyone who uses it; how do you do this? It's not working on mine and it would be really interesting to see where I fare in terms of steps.