Thousands of runners are expected to take part in the RaMathon event in Derby next June.
The attraction enjoyed a truimphant return last year after an 18 year gap and is expected to further build on that success next summer.
The event sold out quickly last year and a huge number of enquiries have already been made for the 2015 RAMathon, which is planned to double in size to 4,000 runners.
Richard Kay, Ramathon race director, said: “We were inundated with requests from people who missed out on securing an entry this year.
Our plan for the 2015 race is to increase the entry limit to meet this demand, whilst keeping the event of “a high quality.
“This will mean the majority of runners who want to race the Ram will get the chance to enter.”
Derby County Football Club is a confirmed key partner and the Derby half marathon will start and finish at the iPro Stadium.
John Vicars, Chief Operating Officer at the club, said: “Everyone connected with Derby County is delighted to see the Ramathon back and bigger than ever. “There is only one place where it should start and finish - and that is the home of the Rams!”
The planned route will still include the villages of Shardlow, Ambaston and Elvaston (and the Castle grounds).