The boy on a mission to change his best friend's life

Meet Vidyut, the six-year-old boy on a mission to change his best friend's life.

Sophie was born with Spinal Muscular Atrophy, a rare condition which causes problems with her muscles.

Sophie isn't able to move around on her own and relies on a wheelchair to be mobile, but the chair she has doesn't meet her needs.

So, Vidyut is running 22 miles, over six weeks, to raise enough money to buy Sophie a new one.

Nina spoke to them to find out more.