The two hand swing is the Power Squat of the kb swings and is the easiest and the hardest of all swings. The easiest because you have two hands on the bell and are the most stable. Hardest because there is no switching off of the pressure as you get in one hand swings and transfer.
No where to run, no where to hide. Which makes what my wife does even that much more impressive. Heavy high rep two hand swings are evil .