[Smithanator]

Holy crap!! I helped my friend yesterday roofing. I can not tell you how sore I am today. I can frame , trim , build a deck. Whatever all day every day and not be sore. It's been like 6 yrs since last time shingling. All I can say is guess it one of those using different muscle things. Mad props to shingle kayers

 

[Smithanator]

Layers

 

[woodworkbykirk]

its like anything physical. different tasks use different muscles. you develep em over time