This is how often science says you should be training to build real, noticeable muscle
Exercises at Home to Build Muscle: 18 Moves with and Without Weights
How Often Should You Lift To Build Muscle? - Onnit Academy
How often should I work out if I want to build muscle mass? - Quora
How often should you work out each muscle group? - Quora
Research Review: How Often Should You Work Out to Build Muscle?
How Often Should You Work Out? Here's What Experts Say
How many times a week should I work out – Absolutely Fitness
Strength Training Guide: Common Myths & FAQs
How Many Days A Week Should You Workout? (FASTER GAINS!)
Should you workout every day to gain muscle? [and how often]
Want To Build Muscle? Here's What To Eat Before And After Working Out