I just finished couch to 5k and I’m running on my treadmill trying to time myself running a 5k. C25k always starts with 5 min warm up and ends with 5 min cool down so I don’t want to count those. I started my Fitbit and restarted my treadmill after 5 min warm up. According to my treadmill I did 3.1 mi but Fitbit told me 2.9? Which should I trust?