Is it really true that adults can do this?

are kids like 7YOs strong? a lot act like they are, how much different is the strength then an adult really, it cant be that much right?
How effective would a 7 year old girls hardest punch be on the average adult? it is really true that an adult can stop their punch mid air while picking up the child? how so given that the child is going at their hardest? couldn't the 7 year old also stop the adults punch mid air? How much different is the strength? is it really true that when playing and Arm wrestling, the adult can pick up the whole child with one hand?