I have not lost any weight.
For the last 6 weeks, I have been actively attending (yes, and participating) in Aqua aerobics for five one hour sessions a week and swimming for two sessions a week (total of 2 & 1/2 hours) and have not lost one pound in weight. I am also walking four extra miles a day. All on top of my 'normal' activities.
I eat healthily, have not upped my food intake - if anything it has actually gone down.