But some fads have stood the test of time for one big reason: they actually work. From mobile apps and fitness trackers to kickboxing and Zumba, these fitness trends are here to stay.
HIIT Workouts1 of 15
You can hardly talk about weight loss anymore without mentioning High Intensity Interval Training, or HIIT workouts. These workouts not only burn an insane number of calories, but they also require less time, making them an ideal fitness option for busy, modern gym rats.
Zumba2 of 15
Zumba took off in the 1990's and is now offered at most gyms across the country. Not only does it get your heart rate up and your body moving, but the fun Latin dancing keeps participants coming back for more, crossing off one of the most important requirements for results-driven fitness—consistency.
Foam Rolling3 of 15
Post-workout recovery is important to every serious runner, cyclist or fitness enthusiast, which is why most now own foam rollers. The form of self-myofascial release allows you to stretch out a muscle, activate soft tissue or target a trigger point that's been bothering you in your training, helping speed up recovery.
Mobile Fitness Apps4 of 15
It's hard to remember the fitness world before the introduction of mobile apps, but we can't say we miss it much. Whether you want a 7-minute workout, a training plan for your first 5K or a guided bodyweight routine, you can have it all—usually for free—thanks to a mobile app on your phone.
Boot Camps5 of 15
Military-style boot camps, usually modeled after SEAL and Army training, aren't for the faint of heart. They may be an especially intense way to work out, but that's also what makes them so effective, especially if you're looking to get in great shape before a vacation or a special occasion. Though most boot camps happen locally—part of their appeal, since you can meet new fitness-minded people in your area—you can also purchase boot camp DVDs to do in the comfort of your own home.
Barre Workouts6 of 15
These ballet-inspired workouts focus on precision and small, controlled movements that will challenge your muscles in a new way. Though you won't get much cardio in, you will get to tone your legs, arms and core. Many people swear by the barre method, and the number of barre studios across the country have skyrocketed over the last 10 years. Pure Barre alone has around 300 locations nationwide.
Obstacle Course Races7 of 15
Warrior Dash, Spartan Race, Tough Mudder—you've probably heard of at least one of these popular obstacle course races, which combine a traditional running race with physical challenges. Not only will you get a great workout in, but you can test your athleticism and grit in a way you never have before with daunting walls to scale, barbed wire to evade and climbing ropes to conquer.
Pilates8 of 15
Though Pilates has been around for quite some time, it took off in the late 20th century when Hollywood stars began to swear by its results. Pilates focuses on strengthening and stabilizing your core through very precise and controlled movements and, though it doesn't involve a ton of cardio, it's a great bodyweight workout.
Fitness Trackers9 of 15
There's probably not a single person reading this who doesn't either own a fitness tracker or know someone who does—that's how essential they've become to our everyday lives. Whether you want to count your steps, track your run or monitor your sleep quality, fitness trackers can do it all, and then deliver tons of valuable data straight to your smart phone.
Spin Classes10 of 15
Indoor cycling has been around since the 1990's, but it recently received an upgrade thanks to the rising popularity of boutique spin studios. In these studios, cycling becomes not only a great workout, but also an immersive experience, complete with darkened rooms, loud music and motivating coaches. At Soul Cycle, one of the most popular cycling boutiques, participants pay around $34 to attend a single class.
CrossFit11 of 15
CrossFit was first founded in California in 2000, and it wasn't long before gyms started popping up around the country. CrossFit's distinct identity is focused around functional fitness and physical preparedness, which means you'll see less cardio and more high-intensity weightlifting. CrossFit has become so popular that it's even achieved a cult-like cultural status among devotees.
Kickboxing12 of 15
Most major gyms now offer group kickboxing classes, and there are even fitness boutiques dedicated solely to this type of martial art. Kickboxing is a serious cardio workout, burning anywhere from 500-800 calories in a 60-minute session, and with all that twisting and turning, it's a great core workout, too.
Hot Yoga13 of 15
Sure, yoga has been around for thousands of years, but hot yoga—and more specifically, Bikram Yoga—didn't became a fitness fad until the 1970's. Held in a room heated to 104 degrees Fahrenheit, 90-minute hot yoga sessions burn more calories than traditional yoga, and many yogis argue the heat can be a therapeutic way to release toxins from the body.