The phenomenon that is boot camp fitness started in the States and is spreading rapidly. Australia has been over run and this summer you can expect to see camps running in various parks in NZ.
Exercising with your friends or making new ones at camp is a great way to motivate yourself and provide motivation for others too.
Don't pay good money to join a gym if you don't want to end up with a generic program to muddle through by yourself. Sign up for bootcamp and you'll notice the results happening straight away.
Check out this article about bootcamps and what they involve.
http://ca.lifestyle.yahoo.com/health-fitness/articles/fitness/rogers-chatelaine/health-surviving_fitness_boot_camp