Muscle pain?

Im 13, and after working with family for a week or so, my arms hurt so much and hurt a lot when I have them straight. Anyone know why? or:I'm 13, and

I'm 13, and after working with family for a week or so, my arms hurt so much and hurt a lot when I have them straight. Anyone know why?

or:I'm 13, and after working with family for a week or so, my arms hurt so much and hurt a lot when I have them straight. Anyone know why?

Tags:muscles,