Lower Calorie Burn??? Help!


Not sure if I’m posting this to the right place but has anyone experienced a much lower calorie burn than the ones Kelli and Daniel estimate? According to my Fitbit, I consistently come in way below the minimum that they estimate but I feel like I am pushing myself really hard. I know they are just approximations but I come in pretty far below. My Fitbit isn’t very old and it’s never been wrong about anything else so I don’t think it’s that. Anyone know why I might be experiencing this and how to up my calorie burn during workouts?