The upperclassmen of the Tennis Club have PE class outside on a cold day. After warming up with exercise moves of their own creation, they take on the high jump.
For example, we could move our arms from 
an 80 degree angle to a more acute one.
¡Mueve tus brazos en 80 grados velozmente!
Por exemplo, poderíamos mover nossos braços
de um ângulo de 80º para um mais agudo.