I know others have observed this too, but I gained 2 pounds today and my body fat dropped 6%. My feet were so swollen I could barely get my bike shoes on today for a recovery ride. I know this is because I rode 100 miles on a tandem yesterday, did a short duathlon Saturday and swam 800 yards Friday. I am pretty sore and tired, and definitely overdid it, but had fun! I hope in a couple of days the water weight will disappear (at least it better!). It is strange how much water can affect body fat too. Tomorrow is yoga and stretching - I am going to try to eat a little less than normal and stay hydrated.