Sydney’s The Big Spin event asks participants to exercise for 12 hours as a fundraising challenge for Ronald McDonald House. Multiple outlets describe the format as a sustained, long-duration activity undertaken to support the charity.
Both sources focus on the same core idea: riders stay engaged for the full 12-hour period and the effort is framed as being for a cause beyond personal fitness. The descriptions emphasize the unusual or demanding nature of the challenge, positioning it as an endurance test tied to raising funds and awareness for Ronald McDonald House.