Weight loss is A LOT more about diet than exercise.
The most probable reason is that when you exercise you get hungrier and eat more than you should.
Possible, but less probable, is that exercise does promote muscle growth. If you're actually skinny to start with, then exercise can build enough muscle to cause a noticeable weight gain. This is why it's not that smart to look at weight alone. One should try to back it up with checking your size(if your waist is shrinking but your thighs are growing you're most probably losing fat and gaining muscle), or fat/muscle ratio.
dont do any exercise and eat mcdonalds
Of Course!! People gain weight everyday, you just have to eat more than usual and dont get too much exercise.
To gain weight with minor exercise you will have to eat foods that are high in fat and carbohydrates.
we need fitness so you dont gain alot of weight and we need fitness you can exercise and get fit.
You gain weight
Exercise
They exercise, and some don't gain weight.
To eat like a pig, or not exercise is an unhealthy way to gain weight.
Exercise often. Stay on a diet when you don't exercise so you don't gain weight.
It could be the increase of muscle.
exercise, but not too much, dont worry about it too much at your age, NEVER skip meals.... this can make you gain weight
you don't gain weight when you eat very little. you need to exercise and eat little portions of your meal and you will not gain weight, you will gain muscle by working out but not the weight.