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Hey Jamo, I have 2 questions for u, not more no worries :)

Ok.
I feel that my weak point in my physique is my chest. So, i'm doing 30 push ups every morning to help improve them (hopefully).

Anyway, i was stretching one day when i realised something. I notice when my arms moved upwards (towards the ceiling), i feel my upper chest muscle start contracting. And when i brought my arms downwards, i found that my lower chest muscle start contracting.