Timing Jenny Mace through the Ultimate Hopscotch course makes for some great bouncing breasts. Something I noticed was that a skilled person could kind of skim through a regular hopscotch course in a constant motion (thus less bouncing, which is sad). So I developed this alternate version, which maximizes the abrupt changes in direction and velocity (thus more bouncing, which is happy). Jenny's got sensitive nipples, so adding various heavy clamps on her runs through made it quite intense. I shot some bonus footage using the 120fps mode in an iPhone 5s, making for smooth slow-motion that lets you see how much the added weight was yanking on her nipples with each bounce.