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Cosmology* » A Riddle from Savolainen*

A Riddle from Savolainen*

There are a lot of rollerskaters on a flat floor.

The only equipment they have are the skates and pelota rackets.
These skaters stay still at their positions and the distance between them is
from five to ten meters. A lot of balls come towards them.

They are not allowed to use their feet for example for skating. The only
thing that they can use their feet is to stay in balance and be able to keep
their feet in such a position that the skates point straight ahead.

How can they make themselves to move forward?