Antonio had barely woke up and was laying down staring at the ceiling.
The day before he was running a lot so he was pretty sore. When he was getting up he put more force than usual.
When Antonio had got to class, the teacher said that she wanted to do something fun outside.
So they went outside and the teacher gave one balloon to each student. She gave them instructions to blow up the balloons but not to tie them.
When the students finished blowing the balloons up the teacher told them to put it in the air and hold it up. The teacher told them to let it go and the balloons went up, with the air inside pushing it up.