Which preposition to use with effortless

beneath Occurrences 1%

Meditation seems to belong to sailing rather than rowing; there is something so gentle and unintrusive in gliding effortless beneath overhanging branches and along the trailing edges of clematis thickets;what a privilege of fairy-land is this noiseless prow, looking in and out of one flowery cove after another, scarcely stirring the turtle from his log, and leaving no wake behind!

Which preposition to use with  effortless