[Beanz]

From the Game Manual

R 34

Non-electrical sources of energy used by the ROBOT, (i.e., stored at the start of a MATCH), shall come only from the following sources:

A. Compressed air stored in the pneumatic system that is legal per R79 and R80,
B. A change in the altitude of the ROBOT center of gravity, and
C. Storage achieved by deformation of ROBOT parts.