Jessica Ennis-Hill grew up in Sheffield with her parents and younger sister. She was introduced to athletics by her parents and turned pro in 2005. She has been World and European heptathlon champion and won gold at the London 2012 Olympics and silver at Rio 2016. She still lives and runs in Sheffield and enjoys reading stories to her son every night. You can find her on Twitter @J_Ennis.

Elen Caldecott co-wrote the EVIE'S MAGIC BRACELET series with Jessica Ennis-Hill. She lives in Bristol with her husband and her dog, Peggy. She has written several warm, funny books about ordinary children doing extraordinary things. You can find her on Twitter @ElenCaldecott.