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2. There’s a trick for building muscle as you age - AOL

   www.aol.com/lifestyle/trick-building-muscle-age...

   Here's how it works: the physical demand for more strength when working out will cause slight damage to the muscles (the tearing that causes soreness after a workout) – don't worry, the damage ...

3. A 70-year-old who got fit after retiring shares 3 tips for ...

   www.aol.com/70-old-got-fit-retiring-113205013.html

   Celia Duff, 70, started doing intense fitness competitions three years ago. She works out five to six days a week and does a combination of strength training and cardio.

4. ‘I Started Working Out At 71. A Year Later, 50 Percent Of My ...

   www.aol.com/started-working-71-later-50...

   Charlene Leibel, 75, started strength training after a body composition scan. Here's how she converted 50 percent of her body weight into muscle. ‘I Started Working Out At 71.

5. Weightlifting - Wikipedia

   en.wikipedia.org/wiki/Weightlifting

   The two main methods of weight lifting to build strength and muscle mass are hypertrophy and overload. Training for muscle size is usually done by achieving hypertrophy which is training with a lighter weight at higher volume or more repetitions. Muscle size increases due to metabolic fibers that result in visible muscle mass growth. [21]

6. Progressive overload - Wikipedia

   en.wikipedia.org/wiki/Progressive_overload

   Conversely, decreased use of a muscle results in incremental loss of mass and strength, known as muscular atrophy. Sedentary people often lose a pound or more of muscle annually. [citation needed] The loss of 10 pounds of muscle per decade is one consequence of a sedentary lifestyle. The adaptive processes of the human body will only respond if ...

7. Bullworker - Wikipedia

   en.wikipedia.org/wiki/Bullworker

   If the contraction of a muscle exceeds one third of its maximum strength, its mass grows and hence also its strength". [6] Furthermore, it is said that he concluded that muscle growth can be attained by exerting 60% of existing muscle strength against a superior resistance for only seven seconds once a day, a fitness technique known as isometrics .