acefitness.org
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ACE Fitness is a leading certification and education hub for fitness professionals, offering credential programs (Personal Trainer, Health Coach, Group Fitness Instructor) and continuing education courses. The site also provides an extensive exercise library, client education resources, and articles and videos on exercise science, program design, and fitness topics.
More resources on Exercise & Fitness
Science of Exercise
Learners who complete Science of Exercise will have an improved physiological understanding of how your body responds to exercise, and will be able to identify behaviors, choices, and environments that impact your health and training. You will explore a number of significant adjustments required by your body in order to properly respond to the physical stress of exercise, including changes in carbohydrate, fat and protein metabolism, nutritional considerations, causes of muscle soreness & fatigue, and the effectiveness and dangers of performance enhancing drugs. Active learning assessments will challenge you to apply this new knowledge via nutrition logs, heart rate monitoring, calculations of your total daily caloric expenditure and body mass index (BMI). Finally, learners will examine the scientific evidence for the health benefits of exercise including the prevention and treatment of heart disease, diabetes, cancer, obesity (weight loss), depression, and dementia.
StrongerByScience
Research-backed training articles
ExRx.net
Exercise directory and muscle mechanics
r/fitness Wiki
Comprehensive free beginner guides and programs
Strength Level
Strength standards calculator, praised in r/powerlifting.
ExRx.net
Exercise directory and muscle mechanics, top rec for programming.