Running a marathon is pretty difficult, and is no doubt more complicated if you're a women and it's that time of the month.
American runner Kathrine Switzer, the first woman to officially run the Boston Marathon in 1967, understands the struggle.
She's teamed up with Kiwi company Hello Cup to create a special menstrual cup for non-profit organisation 261 fearless. She joins us on the line from the US to tell us why.
