Pink has been appointed a UNICEF ambassador.
The 36-year-old singer - who has a three-year-old daughter, Willow, with husband Carey Hart - will focus on children's health initiatives and serve as a spokesperson for the new initiative Kid Power, which aims to inspire youngsters to lead healthier lives.
She said: "The fire was lit, obviously, because I'm a mama.
"Statistically, one in four kids in the U.S. are inactive. And I'm all about fitness and health and positivity. One in four kids, globally, are malnourished. So UNICEF has found a way, with Kid Power, to combat both problems at the same time.
"You're getting kids super motivated to move their feet, and you're also creating, global citizens, where they care, and they're able to help other kids around the world."
The 'Just Give Me a Reason' singer joined UNICEF on a trip to Haiti in July, where she visited a health centre for women and infants, and the expedition reminded her of just how inspirational children can be.
She told People magazine: "They're so ready to fix their world. They just keep going. Kids are so resilient. I sat with this little four or five year old. And she just held her hands on my face and sang to me.
"She's living in a one-room shack with her entire family and hardly any food, and she's taking the time to sit with me and sing with me.
"The kids give me the most hope."