Our Trainers
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Jason King
OWNER & PERSONAL TRAINER
Fitness has been a part of my life for as long as I can remember. Growing up, I stayed active through football, baseball, basketball, track, and weightlifting, developing an early passion for strength, performance, and physical fitness. That passion continued during my service with the U.S. I began my professional personal training career in 2001 at 24 Hour Fitness, where I found my true calling—helping people take control of their health and improve their quality of life. Over the next 10 years, I worked as a Master Trainer and Manager, gaining valuable experience in personal training, program development, client accountability, and fitness leadership. That experience eventually led me to pursue my own vision, and in 2014, I founded Core & More Fitness. Today, with 25+ years of personal training experience, I specialize in efficient, results-driven training with an emphasis on our signature 30-minute sessions. My approach focuses on strength, functional movement, proper technique, and creating programs that meet each client where they are—regardless of age or fitness level. After all these years, my mission remains simple: help people move better, become stronger, feel more confident, and build healthier lives through fitness.
Core Traits
Results-Focused
Training built around clear goals and steady progress.
Time-Efficient
Effective workouts designed to fit busy schedules.
Client-Centered
Programs tailored to individual needs and abilities.
Consistent Approach
Emphasis on discipline, form, and long-term results.
About Jason King
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Kim Jirak
WOMEN’S PERSONAL TRAINER
With more than 30 years of experience in the Orlando fitness community, I bring a combination of knowledge, experience, and genuine passion for helping others improve their health and quality of life. I hold certifications through AFAA, TRX, TABATA, and Small Group Training, along with a degree in nutrition, allowing me to take a well-rounded approach to each client’s fitness journey. I specialize in women’s health and fitness, with a focus on weight management, strength and conditioning, balance, stability, flexibility, and overall functional fitness. I understand that every woman has different needs, abilities, and goals, which is why I believe in creating an encouraging and personalized training experience. Whether your goal is to lose weight, build strength and endurance, improve balance and mobility, or simply feel healthier and more confident, I’m committed to providing the guidance, support, and motivation you need to make lasting progress. Outside the gym, I enjoy traveling, running, and spending quality time with my daughter.
Core Traits
Goal-Focused
Training designed around personal objectives and steady progress.
Time-Conscious
Efficient sessions that respect busy schedules.
Women-Centered
Programs tailored to women’s needs and fitness levels.
Consistent Method
Emphasis on form, balance, and long-term results.
About Kim Jirak
Her training philosophy is built around practical methods that fit into everyday life. With a clear focus on accountability and measurable outcomes, Kim works closely with clients to help them build sustainable habits and achieve steady improvement through structured and focused training.
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Christine Payne
PERSONAL TRAINER
I’m passionate about fitness and dedicated to helping others discover their strength, confidence, and full potential. My fitness journey began as an indoor cycling instructor and eventually led me to become a certified personal trainer. As a four-time Ironman finisher, I understand firsthand the commitment, discipline, and consistency it takes to achieve meaningful fitness goals. My endurance training experience has also given me a strong appreciation for the importance of strength, mobility, proper movement, and a well-balanced approach to fitness. I believe exercise should be both effective and enjoyable. My goal is to create personalized, well-rounded workouts that match each client’s abilities, needs, and goals while providing the encouragement and support they need to succeed. Whether you’re looking to become stronger, improve your endurance, move better, or simply feel healthier and more confident, I’m committed to helping you make lasting progress.
Core Traits
Endurance-Based
Training informed by experience in long-distance and endurance athletics.
Strength-Focused
Programs that emphasize strength as the foundation for performance.
Well-Rounded Approach
Balanced routines that support overall fitness and movement.
Positive Coaching
Encouraging, engaging guidance that keeps training enjoyable.
About Christine Payne
Her training philosophy centers on creating structured yet enjoyable programs tailored to each client’s needs. Christine is committed to helping clients discover their inner strength through consistent training that supports both physical capability and confidence.
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Mike Shishan
PERSONAL TRAINER
I’m a passionate and results-driven personal trainer who believes in combining motivation with smart, effective programming. My focus is on proper form, functional movement, and building strength that supports your everyday life. With a background in strength training, athletic performance, and corrective exercise, I create personalized workouts that challenge you while keeping you safe and confident. Whether your goal is to build muscle, boost endurance, or move better overall, I’m here to guide you every step of the way. You can count on me for accountability, encouragement, and the right amount of push to help you reach your goals.
Core Traits
Results-Oriented
Training designed around personal objectives and steady progress.
Form-Focused
Emphasis on proper technique and safe movement.
Functional Training
Workouts built to improve daily strength and mobility.
Supportive Coaching
Consistent accountability, guidance, and motivation.
