This is the analogy I use.

You are walking down a shopping arcade. But you refuse to be distracted by any particular shop on the way. You see the dress shop for instance but don’t go in, don’t even think about how wonderful that dress in the shop window would look on you or of they have the exact size you need. Then you see the ice-cream shop with 40 flavours. You start to salivate but no you are strong this time, and come back to the present moment. You keep coming back to the arcade itself, keep walking straight, no detours.
Actually I wasn’t joking. Do you think this analogy is a good one?