Fitness trends come and go at unbelievable speed, most are fads, yet some endure. Here’s a few that have taken off in 2012. I ask a fitness professional, Mark Shields, what his opinion on the latest things causing a buzz in the fitness community. Zumba, Paleo dieting, Crossfit, TRX and small group personal training all come under his scrutiny. Actually there’s not too much scrutinising, as these all seem to work in their own ways.