Gain Muscle Mass is a free Android app developed by Steveloper in the Lifestyle category, specifically under Health & Fitness. The program is a comprehensive guide for beginners who want to pack on some serious mass. It offers a 30-day transformation plan for skinny guys, packed with bodybuilding programs to enhance muscle growth. The app provides the best exercises for beginners to build muscle and strength with a focus on hypertrophy, which is the best way to increase muscle mass.

The app also includes an ectomorph workout, a training program designed to build mass for skinny individuals who have trouble putting on weight. The program offers a training guide for ectomorphs, helping them to get the best from their skinny-guy genes. The app is straightforward and easy to use, and the workout plan is designed to help users add mass to all the major upper-body muscle groups while encouraging fat loss for a leaner and stronger physique.