I can pull her off the ground when she locks onto the rope. My twin sons hang on her rope and she drags them around the floor. I never let her bite anything on me but I do let her grab the rope while I hold it I run down the yard and move the rope from one side to the next and then my fiancée turns her lose she only missed the rope once she's accurate and I can say from the time she missed she hits hard enough to take it into the bone.
I'd be careful playing this game. I
NEVER play tug o war with a cd, especially a pit. In my opinion this has contributed to a lot of infant deaths. Dog is taught to play tug o war with a rope or towel. You got the baby laying in a crib, you or grandma goes to get the bady out of the crib and it's wrapped in a blanket. Guess what, dog thinks it's play time. The harder grandma pulls on the baby, the more fun the dog is having.
Just my two cents.