A friend of mine is losing weight/ gaining fitness and I'm encouraging her to use metrics other than weight, body fat, and circumferences. Like resting HR, and HR after 10 minutes on the treadmill at 2.5 mph.

I should probably take my own advice. I could stand to lose a little weight but more importantly I should monitor my fitness, and if I start to lose fitness, take steps (or pedals) to fix that.