The Leicester Tigers Defence Coach ran seven ultra marathons in seven days, running more than 420kms in a week from Murrayfield Stadium, Scotland to Old Trafford Stadium, Manchester with the goal of raising £777,777 in support of Motor Neurone Disease (MND) charities and in the name of former Leeds Rhinos team-mate Rob Burrow.
As well as supporting the MND Association, Sinfield set out to raise awareness and much-needed funds for the disease and various causes supporting finding a cure.
Inspired Burrow, Doddie Weir, Stephen Darby and former Leicester lock Ed Slater and the 4Ed campaign, which has also inspired the creation of The Slater Cup - a trophy to be contested by Tigers and Gloucester Rugby in all league fixtures from the first meeting of the current campaign at Mattioli Woods Welford Road on December 24.
Sinfield has raised more than £5,000,000 with challenges including the 7 in 7 and Extra Mile challenge in recent years and, when he entered Old Trafford on Saturday afternoon during the Rugby League World Cup Final, had surpassed £1,300,000 donated to the Ultra 7 in 7 challenge.
Supporters can still donate to Sinfield's most recent effort HERE - which has added a further £400,000 since completing the week-long effort.