Swimming?
lifting weights?
walking briskly?
jumping rope?
the answer is lifting weights
if it two answer need in the blank
it have to be lifting weights and jumping rope.
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I think you should go to a chiropractic or tell somebody or go to the doctor if ur young I suggest telling your parents
The layer that encloses and protects the heart is
Pericardium
Answer:
Because it helps kill germs.