[notacoward]

Only if your step counts are drastically inflated. I've seen Fitbit users get hundreds of "steps" per hour sitting at their desks. Seven thousand real steps a day is about 5km, which is more than even smug twenty-somethings typically manage.

[noarchy]

Fitness trackers are often quite terrible at counting both steps and heart rate. This means two very important metrics for tracking fitness can't be trusted completely. That said, they can at least give you a rough estimate as to where things stand, so they aren't completely useless.