At Definition Health Clubs 'It's Personal'. We are a Sydney-based group of independently owned clubs. We offer a guarantee on your weight loss goals through our personal training programs. Achieve your health and fitness goals through access to services such as Value-for-Money and Flexible Membership options, Group Exercise, Personal Training, Child Minding and all in the comfort of fully equipped gyms containing electronic cardio machines, free & machine weights and amenities. Our Gyms are located in Blacktown, Brookvale, Casula, Broadway and Smeaton Grange..