Science journalist Michael Mosley shares simple tips that could transform your health.
In north Wales, busy single mum Jayne is in desperate need of an energy boost, but will the chilly challenge Michael has in store be the 'Just One Thing' for her?
In Staffordshire, Aly is looking for a way to help her memory and give her brainpower a boost, but will the challenge of learning a new skill be 'Just One Thing' for her?