"What one practice, if removed from your day/week, would hurt you the most?" (be ready with a follow up question if he just says "eat" or "sleep" or whatever -

"What one practice, if removed from your day/week, would hurt you the most?" (be ready with a follow up question if he just says "eat" or "sleep" or whatever - "do you approach that in an intentional way? have you had to tune how you do that?") "Is there anything I should be asking, but I'm not?" - has occasionally yielded interesting responses for me.