It is always good to make the Zing exercises part of the daily routine. Also, some of our parents use rewards to encourage their children to stick to their program. Sticker charts are often very useful for this, so once they achieve a certain number of stickers your child can receive a treat which you have both agreed on.
If you are part of the Zing facebook group this is a good thing to discuss with some of the other parents. You can also schedule a session with one of Zing's expert coaches who can help with ideas for motivation.