This knex hula hoop is very simple, and requires only two types of pieces. Gray rods (or smaller red ones) and snowflake connectors. As you can see, the hula hoop is made of sections, and each section requires 1 snowflake connector and 4 Gray (or red) rods. When building it, I recommend that it has at least 14 sections. Otherwise the pieces can snap. But there is no limit to how big it can be.
Step 1: Sections, and Final Construction
Start with making each section, then connect then to each other. Continue this process until you reach the desired length. Then hold both ends near each other, and connect. Your hula hoop is now finished!