LOS ANGELES (KABC) -- There are countless ways to exercise, but just like fashion, fitness follows trends, too.
"I don't hear too much about Pilates anymore. I always hear things about the yoga," said John Platero, founder of the National Council for Certified Personal Trainers.
The 2015 survey from The American College of Sports Medicine finds Zumba has lost a little steam, dropping out of the top 20 into 34th.
Same for Pilates, indoor cycling and balance training.
They remained strong, but all failed to make the top twenty.
So what's on the hot list?
"The biggest thing that I see is HIIT training or High Intensity Interval Training," Platero said.
HIIT remains big because its metabolic effects are huge. HIIT classes, like burst training, significantly burn fat and calories.
Studies indicate the workout helps protect against heart disease, insulin sensitivity and high blood pressure.
But taking HIIT out of the number one spot, something equally as effective, body weight workouts are number one for 2015.
That's because planks, squats and push ups help exercisers get fit without having to spend money on equipment or using up a lot of space.
Also topping the charts include wearable technology, online workouts and recovery classes that use tools to help muscles bounce back.
"The foam roller has become the ubiquitous self myofascial release tool, but there's probably some better tools that we can be using to get into more specific areas of the body," fitness expert Jill Miller said.
Miller, who wrote the book 'The Roll Model,' created a program for fitness recovery that was so popular the 24 Hour Fitness chain put the protocol in play, training their group of personal trainers on the concept.
Another big trend predicted for 2016, classes and fitness for people 50 and over.
"The fact that there are 77 million baby boomers, it may be a good time to introduce this because preventative health care is really the way we need to go as a country than reactive health care," said Platero.