Motivation to exercise doesn’t come easily to everyone. It’s so much easier to burn the couch to watch a movie than it is to run or even go for a walk. Changing and staying healthy often feels painful. A few binge sessions here and there, a few missed workouts, and people often push themselves into believing that getting lean isn’t for them.

While there are many others that persist, they tend to automate their training habits to the point of robotic monotony. Runners keep running on the treadmill. Lifters pump their chests and biceps with no regard for fat loss. Yoga queens stay away from intense intervals.

Although any exercise is better than a sedentary life, a thriving, trouble-free body for life should possess conditioning for cardiovascular health, strength, endurance and flexibility while maintaining a healthy low body fat composition. Join group fitness classes to the rescue.

They provide both support and variety, and save you the hassle of planning or asking about your daily workouts. Although the fitness industry keeps innovating in some major cities around the world to combine different disciplines and create complex choreographies, there are some trends that are popular to achieve widespread results and that Hollywood stars vouch for.

1. Boot Camp:

With everything automated and just a click away, most people get too comfortable with sedentary lifestyles and quickly lose touch with their original movement patterns. Regardless of age, everyone should have a basic level of mobility that the human body has developed over the years. Boot camps rejuvenate your body and include timeless, foundational exercises that train you with greater strength and endurance.

Often inspired by military recruit training and often held outdoors, 6-10 minute intervals of cardio should be alternated with bouts of strength training. These classes don’t skimp on body parts and special attention is given to core strength.

Barry’s Boot Camp is a boutique gym that Hollywood A-listers swear by. Fans include Kim Kardashian, Katie Holmes, Jessica Biel, Sandra Bullock, Carrie Underwood, Amanda Seyfried, Christina Applegate and Katie Couric. Where’s the difference? A dark nightclub like lighting with a fast-paced playlist makes boring drills cool.

2. Be crazy:

Recent research in exercise science claims that cycling and sprinting support optimal strength gains and fat loss unlike any other form of cardio. Not everyone can sprint. It is also more painful in some joints, especially the knees. However, spinning is a common, friendly form of cardio that accommodates both beginners and hardcore exercisers alike. Compared to a typical stationary bike at the gym, a minimalist structure spin gear is heavy to engage the core and support the rider’s body weight, especially when getting to your feet while paddling.

Based in New York City, Soulcycle has reimagined the concept of traditional spinning classes . It’s the new Hollywood favorite and boasts a cult following. Famous fans include Lady Gaga, Katie Holmes, Kelly Ripa, Chelsea Clinton, Kyra Sedgwick, Ashley Tisdale, Nicole Kidman, Oprah Winfrey, Bradley Cooper, David and Victoria Beckham. The list is practically endless!

A dimly lit studio marks a signature class, where riders are encouraged to match their pace to the rhythm of the music and instructors cheer with motivational quotes. The class also uses light hand weights to engage upper body and core work while riding, making each session a full-body workout.

3. CrossFit:

A concept of strength training soparticularly part of bodyweight training and free strength training along with Olympic lifts and plyometrics. Crossfit gyms are different from regular gyms. They don’t have mirrors to spoil your vanity or cardio machines, or strength-training machines for repetitive movements.

Workouts often take place in a supportive group environment, but they’re always intense and time-bound. Each day brings with it a different workout, randomly programmed to challenge a different dimension of your physical ability. Popularly referred to as the WOD (workout of the day), it stays the same for everyone. What varies is the intensity. Beginners compete against their own performance with lighter weights or bodyweights, while advanced athletes compete to complete as many repetitions or rounds within a limited time.

This concept of lifting fast weights is responsible for the lean and toned frames of famous Hollywood stars, as well as the buff bodies of some action heroes. Busy parents like Brad Pitt and Paula Patton say they have more time with their families because the intensity of CrossFit keeps all their workouts very short. Other celebrity followers include Jason Statham, Matt Damon, Cameron Diaz, Trevor Donovan, Kellan Lutz, Malin Akerman, Paula Patton, Elizabeth Banks, Vanessa Hudgens, Jessica Alba, and Madonna.