Ireland's Fittest Family returns for a fourth series on Sunday nights to make you feel good about yourself watching others struggle in the mud while you have your feet up in front of the fire. Host Mairead Ronan is joined by coaches Davy Fitzgerald, Alan Quinlan, Anna Geary and Stephen Hunt. The foursome will be putting twelve new families through their paces with a selection of new obstacles and terrains that are sure to be even more taxing than previous seasons. Tonight's episode sees Davy and Stephen push the first six families to their limits at Tough Mudder in Co. Meath.