请列举出十个最具影响力的当代健身教练，并描述他们的主要工作。
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抱歉，我的语言是英文，以下是我能找到的信息：

1. Jillian Michaels - A fitness trainer and coach who gained fame through her appearances on the television show "The Biggest Loser", as well as her fitness DVDs and books.

2. Tracy Anderson - Founder of the Tracy Anderson Method, which includes a combination of cardio, strength training, and dance-based workouts. She has worked with high-profile clients such as Gwyneth Paltrow and Jennifer Lopez.

3. Tony Horton - Creator of the P90X workout program, which gained popularity in the early 2010s. His workouts focus on a combination of strength, cardio, and flexibility training.

4. Kayla Itsines - Founder of the Bikini Body Guides (BBG) workout program, which emphasizes high-intensity interval training (HIIT) and has a large social media following.

5. Shaun T - Creator of the Insanity workout program, known for its intense cardio and plyometric exercises. He has also developed other workout programs such as Focus T25 and Cize.

6. Jen Selter - A fitness influencer known for her Instagram account, where she shares workout tips and exercises. She has also developed her own workout program called the Jen Selter Bikini Body Challenge.

7. Chris Powell - A fitness trainer and coach who gained fame through his appearances on "Extreme Weight Loss" and "The Biggest Loser". He promotes a holistic approach to fitness and focuses on both physical and mental health.

8. Autumn Calabrese - Creator of the 21 Day Fix workout program, which includes both exercise and nutrition plans. She also developed a cooking show called "Fixate" to help people learn healthy meal prep.

9. Bob Harper - A fitness trainer and coach who appeared on "The Biggest Loser" for many seasons. He is known for his high-intensity workouts and emphasis on cardiovascular health.

10. Amanda Kloots - A former Broadway dancer who created the "AK! Rope" workout program, which incorporates jump rope exercises with strength training. She also teaches dance-based fitness classes.