1. Personalized training: Personalized training is one of the most lucrative and in-demand fitness niches. Personal trainers work with clients on an individual basis to create personalized training plans to help them achieve their fitness goals.

2. Online Training: Online training is becoming increasingly popular as it offers people the flexibility to train from anywhere and at any time. Online trainers offer a variety of services, such as training videos, personalized training plans, and online coaching.

3. Group Training: Group fitness classes are a great way to get fit and meet new people. There are a wide variety of group fitness classes available, so everyone can find one they like. Some popular types of group fitness classes include Zumba, yoga, Pilates, and barre.

4. Training for seniors: The senior population is growing rapidly, and there is a growing demand for fitness programs designed specifically for this age group. Workouts for seniors should be low-impact and tailored to the needs and physical limitations of seniors.

5. Women's Workout: Women's Workout is another rapidly growing fitness niche. Women have unique fitness needs and goals, and workouts for women should be designed to take them into account. Some popular types of workouts for women include strength training, HIIT training, and yoga.

6. Sports Training: Sports training is a very specialized fitness niche that focuses on training athletes for their specific sport. Sports coaches must have a deep understanding of the sport and the specific needs of athletes.

7. Sports Nutrition: Sports nutrition is an important part of fitness, and there is a growing demand for sports nutrition specialists who can help people develop healthy and effective eating plans to achieve their fitness goals.

8. Mental wellbeing: Mental wellbeing is increasingly recognized as an important part of overall health, and there is a growing demand for fitness professionals who can offer mental wellbeing services, such as therapy and counselling.

9. Physical recovery: Physical recovery is an important part of training, and there is a growing demand for fitness professionals who can help people recover from their workouts and prevent injuries.

10. Fitness Technology: Fitness technology is booming, and there is a growing demand for fitness technology products and services that can help people achieve their fitness goals. Some popular types of fitness technology include wearables, fitness apps, and smart training machines.