A will be the answer because usually marking your exercise days will become a habit because lets say you would do a running exercise but you want to do it in a certain day well if you mark it on the calendar, it'll become a habit.
answer: A
pushing yourself to a limit so quick is not good for your body
Stressing could cause many things, which may include you getting very emotional because you are all caught up in your mind you are stressing and keeping it all jumbled up which could make your mental state worse.
