For me, I go on weight, Heart rate, and how I feel. It's important for me to be under a certain weight for personal reasons. I don't rely on measurements because unless you take them in exactly the same spot each time, you get variations.

How I feel is important to me. Am I lethargic? Is my digestive system sluggish? Is my skin dreadful? All kinds of things really.

I place a big emphasis on my objective obs as well such as heart rate, respiratory rate, blood pressure - all indicators of health and fitness.

Oh. And I love/hate/love my trainers fancy pants scales that tell you your percentage of body fat. Although being pregnant confuses them