Heavy Lifting

For the past two days I can't lift my arms. Last Friday I acted as messenger as I got our magazines from Shangri-La mall and delivered them to our office at Meralco Ave. (Yes, I walked all the way.) I was carrying 25 copies in my backpack and another 25 in my arms. My back is fine (it's my special power... I have super strength but only applies to things I carry in my bag). My arms aren't. It's just strange to see my arms quivering when all I'm carrying is a glass of water.