Who is better at sport - girls or boys?
Well, Sportsround has a new challenge for some of the sportiest kids in the country.
Each week, one boy and one girl will be challenged to try out a new sport that they've never tried before. Whoever wins will get a point for their side.
The score is currently 3-2 to the boys.
This week we have a very special challenge for Sport Relief...
Sportsround presenters Lizzie and Gavin go head to head - the pressure is on, but who will win a point for their side?
THIS WEEK'S CHALLENGERS: THE BOY
USUAL SPORT: Football
GAVIN SAYS: "I'm slightly nervous, but pretty confident I'll win an extra point for the boys!"
THIS WEEK'S CHALLENGERS: THE GIRL
USUAL SPORT: Hockey
LIZZIE SAYS: "I'm feeling a bit worried because Gavin has just admitted to being quite fit!"
THIS WEEK'S CHALLENGE: ASSAULT COURSE
Gavin and Lizzie will be put through their paces by an instructor. They'll be climbing, crawling and basically getting very muddy.
Assault courses are quite hard work because the activities you do range so much.
From climbing ropes, to crawling through tunnels to getting accross nets.
So it's not all about fitness. You have to be agile, quick and strong too!
Lizzie and Gavin were pushed to the limit by the Marines. But there could only be one winner. And after a hard fight Lizzie triumphed for the girls. So it's now three all.