After watching the guys walk on the roof, carry the shingles, throwing and pulling up the shingles I think it takes talent. But then it might be they are not afraid of heights!

They carried all shingles to the drop point. Then they threw it into the trailer. I can see myself going right off with the shingles!

 

Imagine pushing on a shovel with that much pressure while standing on the peak of a roof! 

   

Bill, the roof salesman, was texting while over seeing the roof. He, however, was standing on the flat roof.