How does Raducanu become more ‘robust’?

“Emma Raducanu needs to get more “robust”, according to Great Britainu0027s Billie Jean King Cup captain Anne Keothavong, but how does the British No. 1 improve her physicality and will she challenge on clay this season? Raducanu suffered from a blister on her foot in a loss to Czech Republicu0027s Marketa Vondrousova at the weekend and has had other injury concerns this year.”