Does anybody remember those exercise ropes that were kind of popular in the 1980s? They were a set of ropes with loops at the ends attached to a pulley. They had a loop that went over a doorknob. You put the loop over the doorknob and laid down on your back and put your feet and hands in the other loops. Then you swished your legs and arms back and forth in tandem, with the pulley providing the guide and resistance. I don't know if I am describing this very well. My mom had a set in the mid-80s, and she absolutely loved them. They eventually broke, and my mom really wants a new set. I'd like to find them for her, but we have no idea what they are called, and I haven't seen them in any stores or online. Does anyone remeber these things or have any idea where I might find some? Thanks.