Korok seed on top of tree near Russ the Shield Surfing guy?

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I am at a large tree down the road from the woodland stable and there is a man here called Russ who tells me about shield surfing and is offering to sell them. On top of the tree behind him is a korok seed platform that requires me to get to the bottom of the hill before the time runs out. I have tried gliding immediately after the timer starts but I can't get to the yellow circle at the bottom in time to get the korok seed. What am I doing wrong?

The Legend of Zelda: Breath of the Wild