Joss Naylor MBE, who is best known for his career as a fellrunner and multi-record holder, was taken to hospital with a suspected stroke before Christmas.
Joss has set numerous records as a fell runner and is known as the King of the Fells, and the Iron Man.
The Fell Runners Association said: “Just before Christmas, Joss was taken into hospital with a suspected stroke. He was subsequently assessed as to the cause and has now started what will be a tiring course of treatment and physio.
“He is in good spirits and, as expected, determined as ever.
“We know that the fell-running community will want to send him their best wishes for a speedy recovery though we would appreciate it if he is not contacted directly at the moment.
“On behalf of the FRA and the fell running community, we send our love and good wishes for a full and speedy recovery to our very good friend and legend of the fells, Ironman Joss.”