Chain any number.
Row 1: Begin from the 2nd chain from the hook, *YO, insert your hook, YO and pull up a loop; pull the last loop through the first two loops on hook. Repeat from * in each chain.
Row 2: Chain 1, turn. *YO, insert your hook into back loop of next st, YO and pull up a loop; pull the last loop through the first two loops on hook. Repeat from * in each stitch to end of row.
Repeat Row 2 until you reach your desired length.