berlin's just starting the BJ (in a baby version, since she's only a year old)-
first, we did recalls over the broad jump straight to me, to get what "over" meant. then, i would stand on the side and tell her over, while tossing either a toy or a cookie straight out in front of her.
then, we move it so that once she lands, i call her and toss the cookie behind me, so she races past me, making a big U.
for some dogs really uncomfortable with it, we run past the bj with them.