Originally Posted by therusty
A retraction turn is going to work the legs more than a cross over. These could have been done more effciently, but I chose to look at the results as being more important because I assumed this was a drill.
Retraction turns don't have to be more energetic. The quads aren't required to support the weight of the torso in transition. The legs can simply relax during transition, permitting them to flex while the torso travels across to the new inside of the turn, the only effort involved is when you extend your legs to pressure and stand on your skis after transition, which is done in all dynamic turns.
Releasing via an up-unweighting action, as in a cross-over transition, requires a force at some point prior to release to cause the CoM to move up. This can be the virtual bump or it can be an active pressing the feet, similar to how you jump while standing. The latter requires effort in addition to the effort of supporting the skeleton, the former lets the turn do the work and permits the legs to relax sooner and extend a bit to cross-over.