'Weight' is a pretty broad term here guys, everything has a weight, not just fat... in theory you could become heavier and loose fat over a period of time. The trick is to use more calories than you consume and do exercises which use fat as the energy source (sprinting etc mainly use carbohydrates like Glycogen), long duration low intensity works the best.

having more muscle mass is actually a good aid to fat loss, the extra muscle you carry uses more oxygen and therefore more energy at rest so its not really a bad thing.

MD made a good point, don't confuse water loss with 'weight' or fat loss... fat is what were targeting hear not 'weight'

Two of the exercises sheps mentioned are good fat burners... skipping hard work over a long period of time, but its relativly low intensity.

your main weakness is that you do no cardio exercises, the jumping jacks would be good to work your fitness but not idea as a fat burner, its also robbing your weight work out of energy and making it less effective, I normaly do muscular work and cardio work in the same session but never mixed up with each other because all your doing is lowering the quality of one work out so that you can rush another.