I just bought a treadmill and was on it 45 min saturday & sunday. Sunday I went hiking up a ski hill also. My legs were sore at the end of the day and come monday I could feel I worked them. I have a great deficit in calories but today my legs feel puffy. I drank 8 1/2 cups of water today, usually do 10.

is this normal? I feel like I gained weight overnight instead of losing

Muscle inflammation perhaps? I know when we overwork our muscles especially with weight training that they become inflamed and need to heal.

I had the same problem a few days ago when I did a toning class with free weights. I was sore the next day (and day after that) and felt tender and like I had gained weight. Sometimes you can feel the soreness a few days after a hard workout which can be a reason for your puffy legs. Just some ideas. I'm sure you didn't gain weight from exercising. Drink more water and take it easy and then check the scale.

Yes--it's like Jojo mentions. If your muscles are sore anywhere in your body, you retain water as part of the repairation process. It will even reflect on the scale.

yes, muscle soreness and water weight. Good luck