Wow....my fish tank was freshwater, but I know what a workout that was! Maybe landscaping? Heavy lifting of some sort?
The moderator had a post on activities quite a while back, said the problem there is an ounce of peanut butter has the same amount of calories no matter who eats it, but a half hour of walking will burn quite a large range of calories depending on the size, intensity, and fitness level of the person doing the activity. As far as I know there's no way to customize the activities aside from fiddling with the time to make the calories match what the gym machine said.
If I keep starting over, eventually it will stick, right?
Current weight: 140
Goal weight: 135