Insane speed needs incredible strength. If you’ve ever wondered why F1 drivers look so exhausted at the end of a race, here's your answer. Katie and Christian find out why F1 drivers need elite levels of fitness, why their necks, legs and cores need to be so strong and why staying hydrated is so important. Racing scientist Dr Diandra Leslie Pelecky talks through the ‘extremes’ F1 drivers experience. Sebastian Vettel’s former trainer Antti Kontsas of Hintsa Performance explains the real reason neck strength is so important. Former F1 driver Alexander Rossi returns to Formula Why to talk F1 training, to ruin Christian’s dreams of ever being an F1 driver, and why super-fit F1 drivers have problems when shopping for shirts… Check out other episodes of Formula Why. Scroll through the feed or use the links below: Why is racing in the rain so difficult? with Mika Hakkinen + Haas race engineer Mark Slade Why are street circuits the ultimate test? with Mika Hakkinen + Bernie Collins Tyres, points + car set-up - Your Questions Answered Why does the USA have 3 F1 races in 2023? Why is F1 Sprint such a challenge? with Kevin Magnussen