KRYSTLE THESEIRA

Female Personal Trainer, Singapore

Women’s Fitness | Pre- & Post-Partum | Strength | Metabolic Conditioning

Krystle helps women build strength—not just physically, but through a deeper understanding of their bodies and capabilities. With a background in strength training and group coaching, she leads the Women’s Club: a space dedicated to helping women master foundational movements, improve their confidence, and train in a supportive, educational environment.

Her coaching combines strength, mobility, and mindset work, with an emphasis on long-term progress rather than quick wins. Krystle empowers clients to take ownership of their health, training, and self-image—free from trends, extremes, or aesthetic pressure.

Clients value her clarity, consistency, and ability to meet them where they are—while still holding a high standard for what they can achieve.

Her philosophy: Strong women lift each other up, literally and figuratively.

Qualifications

• NASM Certified Personal Trainer
• AFPA Certified Prenatal & Postnatal Fitness Specialist
• Girls Gone Strong Certified Women’s Coaching Specialist
• Girls Gone Strong Certified Pre- & Post-Natal Coach
  

Press Mentions

• Coach Spotlight: Krystle and Bronson Take On Hyrox, Mar 2025
• Client Spotlight: Helen Chua, Jan 2025
• Client Spotlight: Samantha Lim, Jul 2024
• How soon can you exercise after getting Covid-19 and what can you eat? Here are some tips – Council for Third Age C3A, Mar 2022
• 3 Instructors Discuss the Pandemic’s Impact on Singapore’s Fitness Scene – L’Officiel, Feb 2022
• 5 Exercises You Can Do While Recovering From Covid-19 At Home – Women’s Weekly, Nov 2021
• 5 easy exercises to do when you’re stuck in a room all day – Her World, Oct 2021
• Stay Active With These Exercises – Straits Times, Oct 2021
• Coach Spotlight: Krystle Theseira, Jul 2021

Social Media

• Instagram: @krystle.theseira

Testimonials

“I love Krystle’s bubbly and outgoing personality, which made the sessions fun and non-intimidating, especially for beginners.”

A big part of my positive experience with “She Is Strong” was the coaching from Krystle. Krystle ensured that my form was always correct, preventing injuries and maximising the effectiveness of my workouts. I am now in a healthy weight range and can eat my favourite foods guilt-free. The programme also had a positive impact on my mental health. I feels happier, sleep better, and have more energy for daily activities.

– Samantha Lim

“I joined Coach Krystle’s “She Is Strong”class for two terms. Her unwavering support, patience, and guidance helped me learn the correct form and execution of body muscle movements, building a solid foundation in my strength training.”

– Hooi Mei

“Krystle was fantastic—knowledgeable, supportive, and truly motivational. She created a welcoming environment in every session, making me feel confident and empowered at every stage.”

I decided to join “She Is Strong” because I wanted to build upon my previous training while being part of a supportive, empowering community. The programme offered the structure, guidance, and connection I needed to push my progress further. Rejoining the programme was easy because my first experience with “She Is Strong” was so impactful. I gained strength, improved movement patterns, and developed a better understanding of my body—all while connecting with an incredible group of women. I knew I wanted to continue that journey.

I’ve gained confidence, strength, and clarity on how minor, intentional adjustments can lead to significant, lasting improvements—physically and mentally.

– Helen Chua

Enjoy a complimentary Personal Training session

New to Level? Start your first consultation with us.

To make sure this is the right place for you we provide a complimentary personal training session for us to learn about your current exercise program, lifestyle, fitness goals, and for you to experience our facilities.