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2. Benefits of physical activity - Wikipedia

   en.wikipedia.org/wiki/Benefits_of_physical_activity

   Routine physical activity is important for building strong bones and muscles in children, but it is equally important for older adults. Bones and muscles work together to support daily movements. Physical activity strengthens muscles. Bones adapt by building more cells, and as a result, both become stronger.

3. Exercise physiology - Wikipedia

   en.wikipedia.org/wiki/Exercise_physiology

   The available oxygen and energy supply, and disturbances of muscle ion homeostasis are the main factors determining exercise performance, at least during brief very intense exercise. Each muscle contraction involves an action potential that activates voltage sensors, and so releases Ca 2+ ions from the muscle fibre's sarcoplasmic reticulum.

4. Strength training - Wikipedia

   en.wikipedia.org/wiki/Strength_training

   Supplementation of protein in the diet of healthy adults increases the size and strength of muscles during prolonged resistance exercise training (RET); protein intakes of greater than 1.62 grams per kilogram of body weight a day did not additionally increase fat–free mass (FFM), muscle size, or strength, [51] with the caveat that "Increasing ...

5. Here's How Often You Should Lift Weights if You Want Bigger ...

   www.aol.com/heres-often-lift-weights-want...

   Lifting weights helps to grow your muscles by contributing to the following responses: 1. Muscle Fiber Activation. Lifting weights engages different muscle fibers, especially fast-twitch fibers ...

6. Physical fitness - Wikipedia

   en.wikipedia.org/wiki/Physical_fitness

   Physical fitness is achieved through exercise, among other factors.Photo shows Rich Froning Jr., four-time winner of "Fittest Man on Earth" title.. Physical fitness is a state of health and well-being and, more specifically, the ability to perform aspects of sports, occupations, and daily activities.

7. The most important core muscles are the ones you can't see ...

   www.aol.com/news/most-important-core-muscles...

   Deep core exercises work the transversus abdominis, multifidus, diaphragm and pelvic floor muscles. This deep core workout will reduce back pain, improve posture. The most important core muscles ...