I monitor my weight every morning to always know where I am at. When I was working on my base training at the beginning of the season, I was always maintaining around 152 ~ 153 lbs. Once my base was set I started to add a little more hill work in my riding week. The miles are the same, just a bit more intensity (I ride mainly for fitness, aerobic with a little anaerobic, and don't need much red line stuff). While keeping the same diet as I have been, I notice that I am putting on weight, and it seems to be the morning after a harder hill ride. I now see weights of 157 lbs on these mornings and then will go back down to about 155 lbs. until my next hill day; in which it will go back up. I usually do hills every four days or so. Any ideas why the different weights? Thanks.