Forearms and Four Arms

We were playing on Wii Fit Plus today, and Aaron was doing the Plank Challenge, which is when you put your forearms down and lift your legs like this: /. Its really hard, and Aaron kept putting his forearms down before they said so, so the trainer kept saying,"Please put your forearms down." Aaron was getting really mad. I was getting impatient, too and said, "Just restart it and put your forearms down!" By then Aaron was really mad, and yelled at me, "I don't have four arms!!"