I give up -- what's the difference between "glide for 10 m" and "coast for 10 m"? There's a video of each and they're listed at different levels but they seem i

I give up -- what's the difference between "glide for 10 m" and "coast for 10 m"? There's a video of each and they're listed at different levels but they seem indistinguishable to me except that the coast looked slower and therefore harder.