When my husband lost nine pounds in three weeks and the scale barely budged for me, that old emotional frustration started to creep in. Even as a fitness coach with over a decade of experience, I had to remind myself of the science: that rapid weight drops often mean losing water and valuable muscle. A slow drop on the scale is usually a clear sign of fat loss. Here is a look behind the scenes at why slow progress is actually the best result, and how to track your success when the scale refuses to move.