Certificate III in Fitness (Gym Instructor) is the entry level qualification required for employment in the Fitness Industry. This allows an instructor to Assess, write programs, teach exercises, and assist people with their gym programs. Certificate III is also the pre-requisite for Certificate IV (Personal Trainer). Certificate IV is a higher level qualification designed to increase the depth of knowledge and skill levels required for more 1-on-1 training. You need Certificate IV to access Personal Training insurance.