As had previously happened with the hula hoop, after a while Fat Pony became too enthusiastic to have his foot on the pallet (= reward), so then I modified that behaviour by rewarding the step off the pallet. So the training was foot on and wait - reward; ask for step off and wait - reward. In this way, Fat Pony learns to wait for the next instruction, rather than anticipating the request or over-enthusiastically offering to repeat the same thing over and over.
Leg Lift sorted :-)