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Animals lose energy simply by existing. The more strenuous the activity they are performing, the more energy they will lose.
Burning felt (a type of fabric) has nothing to do with strenuous activity.
Strenuous muscular activity is basically a fancy way to say exercise. As muscles are worked harder, they demand more oxygen, so your breathing rate increases with strenuous muscular activity.
false
potassium
To avoid injury and to increase preformance, streches for all parts of your body should be done prior to strenuous activites. This should include, but not limit to: your neck, back, shoulders, arms, and legs.
False
Could be growing pains or you did some strenuous activity with them.
No
Alcohol (and CO2), or Lactic Acid
Your best bet would be to put of strenuous activity or exercise until you've spoken to or seen your doctor.
It`s Oxygen