What I did on lunge just smacked my qh's bum with the stick when she tried to kick out in my direction. I think CA puts it very nicely: buck - something bites in bum, buck again - something bites again. Usually couple "bites" (smacks) is enough to get point across. As for the field... Frankly I'm not sure. My horses do it too - they fly around kicking all over the place. I can NOT correct it because it's a big field and they run in liberty (and don't get close enough to me anyway). So I just let them be horses.
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."