Meet Jamie and his 3-year-old son Jacob. They tell us why they're taking on the 60 Minute Challenge for the second time.
"Ever since I was a child, the NSPCC adverts on TV have always stuck with me. Even though they were actors the sadness in their eyes made me want to act.
"I used to donate the £2 a month and did so for years until I thought, "I can do much better than that".
"We've done the Gherkin Challenge 3 times, and this'll be our second time taking on the 60 Minute Challenge. I have to go a bit easy this time around as I am recovering from shin splints, but Jacob's a lot more active now and I hope we can reach 5.5 or 6km in our 60 Minute Challenge."