another one bites the dust

I decided I have to start wearing my pedometer again. Every day. I also need to work on my speed to keep up with Bonnie and make the 15-minute mile. So yesterday I strapped it on. At noon I had 129 steps. At 11:09 pm when I took it off I had 170 steps. I'm either very lazy or it's busted. Again. I wonder if there is one that is fat-girl proof?