You don't need to use any weight during aerobic workout. As longs as you keep your heart weight high enough (140-160bmp) your are enduring an aerobic execise.
It depend on how much you workout.
Workout belts and weight training belts are sometimes different but the two are actually pretty much the same thing.
10 kg
Soccer. MUCH more aerobic (running) excercise
How much weight are we talking about? It's not safe or practical to lose more than a few pounds a week - or a month for that matter.
It depends on the workout, length of workout, how much you eat, and you own metabolism. It varies for everyone, but you can lose about 60 lb. if you do everything right.
Aerobic boxing should burn about 550 calories per hour for the average build 140lb woman. To loose a pound one must 'burn' 3200 calories, so to lose one pound if you eat the exact way you are eating now it would take 6 hours of aerobic boxing.
Generally, experts recommend that you alternate cardio workouts one day, and weight or strength training the next. However, if time is at a premium, spending four minutes on cardio and 6 minutes on weights will give you a good, balanced workout.
At least 3 times a week.
Typically the rule of thumb (in the workout world) is one gram of protein per pound of weight. Thus, if you weigh 135# you should eat 135 gms of protein.
No way of telling, as how much you sweat is a very individual thing.
Both the treadmill and elliptical are good in terms of being fit and losing weight; however, they have differences too. In elliptical, it is a much lighter workout session where the user can't feel too much pain after a workout session, whereas with treadmills provide a hard workout experience.