The block save is a gesture that is used in situations where the thrower has little space, such as wings or laterals backs on a trajectory towards the wing.
Starting from a more upright base position (base position for tight spaces) we push off with both legs and bring both legs together laterally.The gesture can have a horizontal-vertical component (throw up) or a more horizontal component (throw down). The gesture can be short (basically bringing the short leg together with the long leg) or long (requiring more lateral momentum).