The pair are among a string of celebs who will take to the ring for Celebrity Boxing.
Speaking in a promo clip Helen describes the bout as the "ultimate test".
The pair are seen working out in the gym with Helen flipping huge tyres and Camilla doing weights.
They then hit the ring where they train with their sparring partners.
The other fights will see Wayne Bridge take on Spencer Matthews while Hannah Spearritt will go up against former Saturdays singer Vanessa White.
Ahead of the bouts, each celeb will undergo a medical by a BBC approved doctor to ensure they are fit to fight.
As well as this, coaches at England Boxing are working closely with the celebrities to make sure they follow all of the sport’s safety guidelines, medical procedures and regulations.
Sports Relief takes place on March 23 and is hosted by Gary Lineker, Davina McCall and Ore Oduba.
Throughout the night Paddy McGuinness, Claudia Winkleman and Freddie Flintoff will also take on presenting duties as the fun rolls into the early hours.
During the jam packed evening, comedian John Bishop will take on a role he could only have dreamt of as he sets out on a mission to help England win the World Cup.
Robbie Savage’s celebrity all-star five a-side football team will attempt a whopping twelve hours of non-stop football as part of the 5-Live-a-side.
Strictly Come Dancing will bring the glitz and glamour to the evening as three football legends Alex Scott, Chris Kamara and David Ginola don their sequins to show off their fancy footwork.
In other news, Jamie Jewitt got sick of 'pressure' to look good all the time as a model
Jamie was a successful model before he entered the Spanish villa last summer (17), where he found love with fellow contestant Camilla Thurlow.
While he still lands the odd campaign, including for grooming brand Woody's, Jamie admits the pressure is off when it comes to his looks.
"After working in the fashion industry for over 10 years, I can honestly say that I've got pretty sick of pressuring myself to look on point all the time," he sighed to Star magazine. "And I can't say coming out of Love Island has done anything to pull me away from my relaxed attitude."
Unlike most of their Love Island co-stars, including winners Kem Cetinay and Amber Davies, Jamie and Camilla's love has so far lasted the distance.
They've also largely kept their romance out of the limelight, and Jamie, who has openly admitted to suffering from depression and anxiety in the past, has credited his other half with helping ease his mental health issues.
"I have plenty to keep me busy and have met an amazing girl to share it all with," he smiled. "I'll always have my days, but I try my best to stick to what makes me happy, help the causes I care about and try not to let myself get dragged into superficial things that made me unhappy in the first place."
*Sourced from the Sun and new! magazine*