Some methods of progressive resistance exercise used to improve muscle fitness would be to increase the weight you lift. Do the same amount of reps and sets each week along with that but only increase your weight percentage by 2 or 10 of your RM load at a time. Don’t go overboard.
During exercise, stored chemical energy is converted to energy that can be used for muscle movement.
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That would be hard because the black Death was a long time ago
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