[Mako watches Chekov kick, then he switches his gaze to Korra's demonstration.]

Yeah. You'll want to rotate your arms separately, so. [He takes one of Chekov's arms and extends it in the air, well aware it's going to feel awkward.] While this one is up like this? This other one... [He taps his other arm,] that's already going to be propelling you. Just think of your arms as one big propeller, and keep your palms flat.