Start by lying on the back - arms relaxed at each side - push shoulders into the mat - roll the skates back towards the body bending at the knees and lift the hips from the floor - engage core - roll one leg away from the body - start rolling on four wheels, as the leg extends outwards flex the foot raising the front wheels off the floor and continue on two - reverse the movement, roll the leg back towards the body bending the knee - start on two wheels and end on all four - keep the hips square - alternate legs and repeat action.