I swim minimum 2 miles a week. Kayak for hours every weekend.
here, try this website:
it has hundreds of activities to choose from. plug in your weight, how many minutes you do a certain exercise per week and you'll get your total calorie burn.
i put in 150 lbs and entered 60 minutes of moderate swimming (this means 60 minutes of constant swimming, no breaks, no hanging out, pure swimming). 30 minutes per mile seems reasonable. total calorie burn = 414 calories.
kayaking is not an activity to burn calories, plain and simple. Do you know why you're physically capable of kayaking "for hours" every weekend? nuff said.
my estimation, you're burning around 700-800 calories a week. you know as well as i do, that's not nearly enough to melt your growing rear end.
NOW, change the activity to running. if you ran for 40 minutes a day, 4 days a week, at 6mph (slow but i'm trying to be realistic) you'd burn 1,824 calories. that's more than DOUBLE what you're burning now. if you eventually worked up to 7mph, you're now at 2,088.
your problem, like so many others, is you think you exercise, but you really don't. do something that really makes you breath heavy, really kicks your a$$ several times a week....and poof!....the fat disappears and your tail be lookin' fine again.