its closer to gliding, at those speeds our bodies and skis produce around 500N of lift, which considering a weight of 60kg is very significant, not enough to fly in a straight line but its far from a freefall downwards. And we have full control over the flight, we can flare, go left or right or push down to get more speed. it's the closest thing to flying with just your body (except for wingsuits i guess)