In the interim I don’t believe that it would be unreasonable for the Committee to have the lock changed on the Plant Room. The Lot Owners do not have an automatic right to a key to this room. A sign could be placed on the door stating ‘Plant Room – Authorised Acess Only’.
The gym owner will then need to approach the Committee to gain access to his gear. The Committee could then state that due to safety concerns, breaches of the Act, breaches of building codes, and breaches of by-laws (nuisance, damage to common property etc etc) that the gym equipment must be removed immediately. This could be done under the supervision of one or more of the Committee members.