There are many human relations skills which can help you to more willingly take on a challenging subject. Greater self-confidence is one of those for example.
Being more self-confident enables you to trust more in yourself and therefore to also think you can succeed better with more challenging topics in comparion to the scenario where you don't really think highly about yourself.
C. Not all exercise takes max effort. You can walk as exercise but it’s not putting forth as much as a run or sprint.
I believe It will collapse on it's self and form a blackhole, most stars do this when they've burnt out all their fuel.
Answer:
peer pressure, stress relief, rebeling againt parents (mostly in teens), coping woth PTSD
Explanation: