A South Melbourne gym has been the target of a second arson attack within 24 hours, prompting a police investigation. The incidents occurred at the same location that previously experienced a violent hammer attack involving prior ownership. Authorities are treating the arson cases as suspicious and are actively seeking information regarding the perpetrators. The gym has a documented history of incidents, raising concerns about ongoing safety and potential motives. Firefighters responded to both incidents and were able to contain the damage, though the extent of the repairs needed is currently unknown. Police have not yet established a link between the previous hammer attack and the recent arson attempts. The gym remains closed as investigations continue and assessments are made.