Space Walk is a condition that occours to UNSC personnel that spend too much time in microgravity. It is likely that their legs become unaccostomed to holding their body weight after spending extended time free floating. As a result, when they return to an atmosphere with stable gravity, they have a strange lope to their walk. This is called "space walk" by crewmen.
Recent developments in Gravity Plating may wipe out this condition, as humans will spend less time in microgravity.
NOTE: This term is only a nickname for Muscular Atrophy, an anatomical pathology.