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oxygen
When you exercise you breathe heavier and faster, your heart beats faster, your muscles hurt, and you sweat. These all relax when you finish exercising.
with proper form you can.
Skeletal Muscles
During exercise the trained body learns to redistribute blood from less active tissues like the digestive organs & kidneys to the heart & skeletal muscles.
When you exercise you use your muscles and your muscles contain Glycogen which could be considered your "energy source". during exercise your muscles use glycogen depleting your energy levels making you feel tired.
lactate
Type of fermentation that occurs in muscles during rapid exercise? Answer: lactic acid fermentation
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To your muscles which you are using.
>95%
Because the heart beats faster during exercise to ensure that oxygen gets to the working muscles.