Manchester United have brought in the world-leading athletics coach, 78-year-old Harry Marra, who had last worked with Olympic champion decathlete Ashton Eaton. The Times wrote about new manager Ruben Amorim expressing concerns over body-fat and conditioning levels of the struggling squad, after replacing Erik ten Hag as manager back in November. “As a result, United are now working with renowned athletics coach Harry Marra for several weeks in a bid to address these issues,” according to The Times. Marra will work closely with United’s interim performance director Sam Erith, according to The Athletic, and his focus will be on honing the players’ sprint mechanics as they try to match Amorim’s high demands, of a pressing game. Story continues below this ad In December, Amorim had stated, “Even with the best starting XI on the planet, without running, they will not win anything. It’s very clear. If you want to win the Premier League, you have to run like mad dogs. If not, we are not going to do it, that is clear.” Marra is of …