...basically means instead of horizontal and vertical straight lines, all straight lines are executed on 45 degree angles. Here's the link to the aresti on the NSRCA site. Picture is worth a thousand words

[link=http://nsrca.us/proposedsequences/2011sequences/147-2011sequences/119-2011intermediatearesti.html]Proposed Intermediate 2011 Aresti[/link]

Humpty...when described as pilot option it can be executed push or pull otherwise it will be defined (mandated) in the maneuver description.