Which Olympic champion turned TV interviewer with an impromptu workout in the park (she's not really a blonde)
and a dazzling gold medal winner, but she wasn't easily recognised when she put on a wig and took a microphone into Hyde Park.
For regular morning fitness fanatics the last thing you expect is to bump into Sheffield's finest, Jessica Ennis. But one runner got more than he was expecting when she stopped him for a chat – and then offered an impromptu workout.
Scroll down to watch the video
Disguise: Jessica Ennis has a wig fitted as she prepares to undercover and surprise runners in London
Ennis initially donned a wig, grabbed a microphone and film crew and questioned runners in London's Hyde Park about their training habits.
Then, having revealed herself to one unsuspecting participant, the 27-year-old Olympic heptathlon gold medallist spent an hour showing him ways to improve his fitness.
Using equipment ranging from a medicine ball to a park bench, the amateur athlete is put through
The video was shot as part of a new Powerade campaign: ‘You Have More Power Than You Think'.
And with Sunday's London Marathon fast approaching, what better time to pick up some last-minute tips
For more information and to download the training tips, click here.
Up close and personal: Ennis stopped unsuspecting runners to quiz them on their fitness regimes
Surprise: Ennis reveals her true identity to one runner before taking him through a workout
Working out: Ennis takes the amatuer athlete through a session involving a variety of exercises