It can be a chemical imbalance in the brain, a traumatic event, bad home life, etc.
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an Endocrinologist is a doctor that deals with diabetes
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When comparing a weel-designed muscular strength workout to a well-designed muscular endurance workout, the difference between is muscular strength was assessed by the one-repetition maximum (1RM) ... well-designed MRT exercises seem to be effective for improving muscular fitness.
In strength training, muscular endurance refers to the number of repetitions of a single exercise you can do without needing to stop and rest. Examples include how many times you can do a full squat, a sit-up, or a bicep curl with a light-to-moderate weight before breaking form.
The specific type of muscular endurance used during cardiovascular fitness activities such as running, swimming, or cycling is usually called cardiovascular endurance or cardiorespiratory endurance and is different from the strength training definition. Endurance training for these types of physical activities builds the energy systems of the body, the muscle fibers, and capillaries that can sustain long periods of exercise, such as running a marathon or cycling a 100-miler.
Some examples are the mouth, nose, eyes, lungs, stomach, and the trachea.
