Catch me if you can! Competitive Kate tries to outrun her husband but gets royally beaten by Prince Harry as they take part in a relay race at London's Olympic park 

• The Duke and Duchess of Cambridge join Prince Harry for a training day at the Olympic Park this afternoon 
• Their royal highnesses are gearing up for 2017 Virgin Money London Marathon for Heads Together 
• Team Heads Together which is the campaign to change the conversation on mental health

The Duke and Duchess of Cambridge went head to head in a relay race this afternoon alongside Prince Harry as they took part in a training day ahead of the London Marathon.

Competitive Kate tied her hair back as she pelted full throttle along side her husband during the 100m sprint which took part at the Queen Elizabeth Olympic Park (QEOP) in London on Sunday.

Despite her efforts the Duchess, 35, lost out to her brother in-law who came in first thanks to the encouragement of well-wishers from the sidelines.  

It seems that the mother-of-two might have missed the memo this afternoon as she arriving in a pair of jeans which might have been to blame for her loss.

The Duchess may have ditched her usual high glamour in favour of a bright orange puffa jacket but it seems she wasn't prepared to stoop to a pair of joggers for the training day.

Kate paired her £280 quilted ski jacket by Perfect Moment with a pair of black skinny jeans which will surely prove a challenge to run in.

Kate joined her husband the Duke of Cambridge and brother-in-law Prince Harry for a training day with the runners taking part in the 2017 Virgin Money London Marathon for Heads Together, the official Charity of the Year.  

The training day is for Team Heads Together which is the campaign to change the conversation on mental health which is spearheaded by the royal trio.

Prince Harry appeared to have looked to his sister-in-law for style advice also pictured in a puffa jacket in navy blue and appeared, too, to have shunned joggers in favour of jeans. 

Equally Prince William appeared to have forgotten his kit showing up in a pair of khaki chino style trousers and a navy woolen jumper. 

While she may have come in last there appeared to be no hard feelings between the Duke and Duchess this afternoon.

The royal couple appeared to be in a particularly flirtatious mood today and could be seen embracing one another following the race.  

Approximately 150 runners are taking part in the training day, which will include a run around QEOP and a training session on the London Marathon Community Track, beside the former Olympic Stadium. 

The day will also include informative presentations and question and answer sessions in the Copper Box Arena, on training and preparing for a marathon from specialists in areas such as nutrition, running and stretching.

Team Heads Together runners will also receive advice and encouragement on how they can lead from the front in achieving the campaign mission of starting millions of conversations on mental health in 2017.

The runners are fundraising for the eight Heads Together Charity Partners or the campaign itself and there will be a session to support their efforts in raising funds for the services and support giving vital help with mental health, day in, day out.

The Duke and Duchess of Cambridge and Prince Harry will join runners while they are training on the London Marathon Community Track and at a warm down in the Copper Box Arena, before The Duke gives words of encouragement to the runners.

Their Royal Highnesses will also set out how all 38,000+ runners in this year’s Virgin Money London Marathon will be able to help Heads Together make it the ‘mental health marathon’, alongside supporting whichever great charity or personal cause they may be running for.

Their Royal Highnesses will be joined by Paula Radcliffe, the current Marathon World Record Holder and three-time London Marathon winner, who will also give advice and encouragement to the assembled Heads Together runners. 

British 400m Record Holder and London Marathon regular, Iwan Thomas, will also join the training day as part of the Team Heads Together team running this year’s Marathon and take part in a Q&A session.