Hmmm....I don't know if this would help your lead, but I like to set up 4 or 5 cross-rail jumps in a circular formation at increasing heights (like the first would be 2', the next would be 2'4", then 2'8", etc) and go around a couple times. That's my favorite warm-up. For regular riding, I like to go over hog's back jumps about 3'-3'8" tall. That really works their muscles and gets them ready for shows fast. Hope it helped!
~Riding Western And English Since Age 4~
~Loves People And Horses Of All Kinds~