I want to gain weight and build some muscle .i often quit exercise after few days of starting . how to make habit of exercise ?

Lack of Motivation: I understand your need to gain weight Feel good about your accomplishments Accept your appearance, muscles, weight at this time Do not put pressure on yourself to impress others Do not put pressure on yourself to gain weight fast Use Pilates, Yoga See a Fitness instructor to build muscle See a Nutritionist for Balanced Diet with 2500 Calories/day See a Therapist for your lack of motivation