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- Muscle strength (27)
- Physical education and training (18)
- Physical fitness (8)
- Physical fitness--Physiological aspects (7)
- Exercise--Physiological aspects (5)
- Weight training (5)
- Athletes--Training of (4)
- Sports--Physiological aspects (3)
- Biomechanics (2)
- Exercise (2)
- Muscles--Anatomy (2)
- Personal trainers (2)
- Athletic training (1)
- Bodybuilding (1)
- Speed (1)