Truphena Muthoni (born 2003) is a Kenyan environmental and mental-health activist whose advocacy uniquely blends climate justice, wellbeing, and endurance performance. Raised in Mathira, Nyeri County, her early life was deeply shaped by time spent collecting firewood and medicinal herbs with her grandmother—experiences that forged a lasting bond with nature and later informed her activism, which frames the natural environment as both a life-support system and a source of psychological healing . Muthoni rose to national and international prominence through her use of endurance tree-hugging as a form of silent protest and healing. In February 2025, she set a Guinness World Record by hugging a tree continuously for 48 hours, then broke her own record in December 2025 with a 72-hour silent tree-hugging marathon in Nyeri, during which she blindfolded herself in the final hours to honour the visually impaired . Her work has since positioned her as a leading youth voice linking planetary health with mental wellbeing, particularly among young people and marginalized communities.