Serena Williams has helped donate 4.25million face masks to schools.The 38-year-old tennis star – who has two-year-old daughter Olympia with husband Alexis Ohanian – is doing her bit to make sure there are enough face coverings for children in the US to help stop the spread of Covid-19 before schools return later this year by joining forces with the Masks For Kids program.Serena admitted she is ‘grateful’ to be able to help out and educate schools about the resource.She wrote on Instagram: ‘Getting back to school this fall means having #masksforkids to wear. ‘I’m teaming up with @bellacanvas, the National School Board Association and @scholasticinc to donate 4.25 million masks to underserved schools and provide educational materials about.