Yes, swimming! I was on a swim team from age 7 to 19 and ate all the time! It was non-stop. I know in high school when we had 2 a day practices I would go to the locker room to "go to the bathroom" in the middle of practice just to eat a snickers because I would be so hungry. Also, as far as excercise without losing weight, I think weight training is suppose to do that.
In other news...I had been really trying to gain weight and after 2 weeks of stuffing myself and forcing myself to eat I gained 3 lbs.and was broke from spending all my money on food! Then the next week I didn't force myself to eat extra and I lost 2 lbs. I am hoping that once my 25 lb. 1 YO starts walking I will be able to gain a little more easily since I won't be carrying her around as much.