Websites, databases, and organizations providing evidence-based information regarding training, nutrition, psychology, and more.
The National Strength and Conditioning Association (NSCA) is one of the world-leading organizations for the strength and conditioning profession. Their site provides evidence-based resources for athletes and coaches across various sports.
Examine.com is an excellent resource that provides a large database of supplements and their corresponding body of scientific literature surrounding use, benefits, dosage, etc.
NutritionFacts.org is a great resource for evidence-based information on food and nutrition more broadly as it relates to health and performance.
Association for Applied sports Psychology (AASP) provides access to information related to sports psychology as well as a finder for sports psychology professionals that can help athletes.