How to Gain Weight the Healthy Way. If you need to gain weight, it’s important to do it right, gain weight step by step. Weight gain diet and exercise in 30 days: With this weight gain app you will get a customized nutrition plan, your diet will adjust as you progress to optimize your results. Gain weight app features: ★ Diet food recipes (diets that work for women). ★ Workouts for women at home ★ Weight gain tracker ★ Customized plan ★ Offline & free fitness app for women ★ Check-in each week *Icons made by Freepik - www.flaticon.com *Woman photo created by benzoix - www.freepik.com