see my post 

https://muscle.userecho.com/en/communities/1/topics/416-have-a-section-for-body-circumferences-and-fat-measurements

I completely agree

Caliper measurements of at least 4 areas would be a good start to measure body fat percentage and update weekly to see a chart/graph of progress. 
creating an alert to tell you measurement are due today. I did forward a sceen shot of a measurement idea to the Dr Muscle team for Eve but would be great to have in both apps.