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Physical fitness - Wikipedia
Fitness: Definition, factors, and types - Medical News Today
What Is Physical Fitness? - Human Kinetics
Physical Fitness and Its Components - Physiopedia
Fitness: What It Is, Health Benefits, and Getting Started
Physical activity - World Health Organization (WHO)
Exercise | Definition, Types, Principles, & Health Effects
Fitness basics - Mayo Clinic
Physical Fitness - SpringerLink
Physical fitness Definition & Meaning - Merriam-Webster