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Sienna’s 21 for Under 21 is a youth-led community initiative by Sienna, a 16-year-old student from North Sydney. As part of this initiative, Sienna is challenging herself to train for and run a half marathon (21km) on 3 May 2026, with the goal of raising $12,000 AUD to mobilise financial and essential resources to support vulnerable children and women in her local community.

Sienna has chosen to partner with Taldumande Youth Services, an organisation that provides safe housing, practical support, and wellbeing resources for young people and families experiencing disadvantage. The funds raised will be directed to Taldumande Youth Services or used to purchase much-needed materials and resources for those most in need. Sienna was inspired after seeing first-hand, while delivering food care packages to residents in Taldumande housing, how vital these services are in making a real difference in the lives of young people.