Is 10k steps really necessary with Olympian Prof Greg Whyte and then could you help with a cardiac arrest?

We have all heard aobut the 10k daily steps -I chat with olympian and exercise acadenic Prof Greg Whyte and it might not be correct! Allos why is Greg on a treadmill up Snowdon?

Then would you know how to use a defibrilator in an emergency? The medical director of St Johns Ambulance, Prof Andrew Hartle, tells us what we need to know.