Google Fit App

Hello, does anyone have experience with the Google fit app? I downloaded it to act as a pedometer because I don't have one, and the steps seem like they're way off. For example, it counted over a thousand steps this morning, but my phone was lying on a table the whole time so I don't see how it's possible it would know how much I'd walked.
I've tried to browse through the app for info and it's very limited. If the Google fit app isn't a good pedometer, what apps do you recommend?