<human>:  What is the most efficient way to build muscle and gain strength?
<bot>: The most efficient way to build muscle and gain strength is to create a personalized workout routine that focuses on progressive overload and utilizes a combination of strength training exercises, aerobic activity, and proper nutrition. Focus on compound exercises that target multiple muscle groups, and make sure to vary your exercises and track your progress regularly. Be sure to get plenty of rest and recovery time in between workouts to ensure you give your body the time it needs to repair and grow.