Muscle fibers vary in composition, function and fitness requirements. Although genetic factors dictate distribution of muscle fibers, physical activity regulates fiber vitality. In fact, you may be unknowingly neglecting a significant percentage of your muscle mass.
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Although related, muscular strength and size depend on different training protocols for enhancement. For instance, large-muscled bodybuilders are likely less strong than smaller-muscled Olympic weightlifters, or strength athletes, due to differences in muscle physiology and training programs.
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The overload principle of strength training dictates your fitness outcomes regardless of fitness level or exercise goal. For example, proper application of overload separates long term results from wasted gym time.
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Your body’s total volume of blood, equaling 4 to 6 L, passes through your heart every minute during rest. Changes in cardiac output during exercise increase blood cycling rate up to 21 L per minute in active individuals and 35 L per minute in elite athletes.
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Biking and running are popular choices to burn calories, but if you don't enjoy these sports don't be afraid to try other outdoor sports, such as kayaking, to burn calories while you have fun.
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