They ARE THIRTEEN YEARS OLD.
AND they ARE VERY SPORTY.
They OFTEN GO TO THE GYM - AT LEAST THREE TIMES A WEEK.
MARK DOES EXERCISES TO MAKE HIS ARMS STRONG.
HE CAN* T WALK BECAUSE OF A CAR ACCIDENT, SO HE GOES EVERYWHERE IN WHEELCHAIR.
BUT IT DOESN* T STOP HIM DOING THE THINGS THAT BOYS OUR AGE WANT TO DO.