3,200 calorie deficit soundss a bit like maybe something is not right with the app. I am 5'4" and weigh 140 pounds- which is still a bit heavy, but if I ride full out as hard and fast as I can which is an average of 20 mph, I burn about 450 calories according to my body monitor which figures calorie burn by heart rate, respiration, sweat rate, body temperature and ambient air temperature which means that if I ride 4 hours I still am within my alloted burn on 2000 calories. In order to build a deficit of 500 calories or burn 2500 calories, my 2000 daily allotment plus a 500 deficit I have to ride 6 hours full out. Now admitedly, I have the metabolism of a sloth, but I do wonder about monitors that are based only on heart rate since Ican pop my heart rate by doing squats.

It's all very confusing, and somewhat depressing since the maintainance of a body weight without losing muscle tone unless you ride or exercise on a daily basis gets harder and harder as you age.

Just some random thoughts.

marni