If you are gaining muscle, muscle weighs more than fat, thus making you gain wait even though you can possibly look smaller, but leaner.
To gain weight with minor exercise you will have to eat foods that are high in fat and carbohydrates.
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.
It could be the increase of muscle.
Exercise often. Stay on a diet when you don't exercise so you don't 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.
If you stop your exercise , your body will gain weight
You can gain weight from any food if you do not eat a healthy diet and exercise to keep your weight in check.
A good balanced diet and plenty of exercise. weight gain in muscle is far more attractive and healthy then weight gain in fat.
They usually do not exercise.