Start with a ponytail and take a chunk of the top of the ponytail and bring it forward.
Part the bottom of the hair in two and bring the top of the hair down.
Tie the section you parted in two with an elastic. It essentially gets tied up on top of the section of hair you brought down.
Repeat the same steps until you go as low as you want the chunky braid to go.
Pull at the hair ties as if you were tightening a ponytail. This will create the chunky effect.
That's it! You can pull as much as you like to make the braid chunkier!