Answer:
myoglobin
Explanation:
when a muscle is damaged, myoglobin goes into bloodstream
Answer:
Vaccinations are not always effective.
Explanation:
trust me
Answer/Explanation:
It gives you a goal of how hard you want work. Which will increase the amount of calories burned and strength earned. But it is also limited so that you don't overdue yourself; this will cause health issues in the future.