History of changes in weight, FTP, and other changeable variables over time
As weight and FTP change over time, so do watts/kg etc. It would be interesting to be able to track progress of weight loss (for example) and increases in watts/kg over time. It would also be interesting for strava as a company to be able to see the total weight lost, or power/kg gained by their members! Proof the website has a positive effect on people!