Yes, every exercise should include both of these. If you exercise without warming up you could easily pull a muscle or worse.
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Answer:
b
Explanation:
a and d are wrong and it can be push down to atleast 2 inches
You should hold a stretch for as long as it does not become too painful for you. Stretch as much as your body needs but not too much because, it could tear up your muscles and tendons. This is the best answer i could give you.
The answer would be artificial pacemaker.
