references
  
      International Journal of Environmental Research and Public Health: "Maximizing Muscle Hypertrophy: A Systematic Review of Advanced Resistance Training Techniques and Methods"
    
      Journal Strength and Conditioning Research: "Influence of Rest Interval Length on Acute Testosterone and Cortisol Responses to Volume-Load Equated Total Body Hypertrophic and Strength Protocols"
    
      Journal of Cachexia Sarcopenia Muscles: "Muscular responses to testosterone replacement vary by administration route: a systematic review and meta-analysis"
    
      The World Journal of Men's Health: "‘Testosterone Boosting’ Supplements Composition and Claims Are not Supported by the Academic Literature"
    




Can't gain muscle? While "hardgainer" isn't an official medical term, for some people, it is harder to bulk up.

Image Credit: mustafagull/iStock/GettyImages

Image Credit: mustafagull/iStock/GettyImages

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      International Journal of Environmental Research and Public Health: "Maximizing Muscle Hypertrophy: A Systematic Review of Advanced Resistance Training Techniques and Methods"
    
      Journal Strength and Conditioning Research: "Influence of Rest Interval Length on Acute Testosterone and Cortisol Responses to Volume-Load Equated Total Body Hypertrophic and Strength Protocols"
    
      Journal of Cachexia Sarcopenia Muscles: "Muscular responses to testosterone replacement vary by administration route: a systematic review and meta-analysis"
    
      The World Journal of Men's Health: "‘Testosterone Boosting’ Supplements Composition and Claims Are not Supported by the Academic Literature"