Cardiorespiratory endurance is a measurement of how well your heart, lungs and muscles work together to keep your body active over an extended period of time. Exercisers can improve cardiorespiratory endurance by participating in a program of regular aerobic exercise.
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1, It most likely she will change. Everyone has their rough times.
2, A personality disorder affects the way you think, behave, and go on with your everyday life. A example is Borderline Personality Disorder.
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i hope this helped at all.
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John spent the last few decades doing CrossFit, but now that he's a bit older, he's decided to switch to more individualized training to retain the physical benefit of strength building ( first choice).