In a few hundred years, some archaeologist is going to come across this, and spend the rest of their life trying to answer the simple question - "WT(H) is this?".My daughter used to be instructed into hitting into something rigid . Usually at her lessons inside they woujd tell her to swing into the heavy rubber backstop a few times to have strong point contact .. I like you always thought it should continue after the point of contact to be able to finish swing ! So my buddy and I made this this comes apart but the base that has wheels is over 100lbs for stability ! It height adjusts but it allows her to extend thru her swing .. we do however use wrist guards when she attacks it