FlexForm
Train Smart | Stretch Strong | Live Well
Personal Training & Stretch Therapy Delivered to you
Meet Sebastian
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Hi! I'm Sebastian Castillo, founder of FlexForm. I'm a Certified Personal Trainer and Stretch Therapist serving busy adults in South Florida.
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My mission is simple - Help you move better, feel stronger, and live pain-free by using customized fitness and mobility plans designed around your specific needs and goals.
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With over a decade of training experience, I've helped many people transform not just their physical health but also their confidence and quality of life through fitness.
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Whether your goal is to lose weight, build muscle, improve flexibility, or recover from tightness and stiffness, I'll guide you every step of the way using safe, effective, and proven methods.
My Expertise
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Weight loss & toning
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Muscle & strength building
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Flexibility & mobility
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Assisted stretch therapy
Personal Training
Mobile Personal Training – built around your goals, your schedule, and your space.
Whether you want to tone up, lose body fat, build muscle, or simply feel stronger, FlexForm brings expert, results-driven workouts straight to your home or preferred location.
Benefits:
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Burn fat & build lean muscle
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Strengthen safely with proper form
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Train at home or your preferred location
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Programs 100% customized to your goals
Every session is personalized, efficient, and led by a certified trainer who keeps you safe, supported, and motivated.
Stretch Therapy
Experience the power of professional assisted stretch therapy – delivered right to your door.
FlexForm’s mobile stretch sessions are designed to relieve tension, increase flexibility, and improve mobility so you can move freely, perform better, and feel your absolute best.
Benefits:
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Relieve muscle tension & stiffness
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Improve flexibility & joint mobility
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Move with more freedom & energy
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Recover faster and reduce pain
Whether you’re an athlete, office worker, or simply tired of living with stiffness or pain, one-on-one sessions will leave you feeling like a new person.
Services
Choose the plan that fits your goals
Whether you want to build strength, improve mobility, or move pain-free, every session is tailored to deliver real results.
Personal Training 1 Hour
Customized 1-on-1 training focused on strength, conditioning, and performance.
Build muscle, burn fat, and progress safely with a program made specifically for you.
Stretch Therapy 30 Minutes
Targeted mobility work to release tension, reduce stiffness, and improve flexibility in key muscle groups. Perfect for quick recovery and relief.
Stretch Therapy 50 Minutes
A full-body stretch therapy session to reduce tension, increase range of motion, and support faster recovery and better movement.
Katia Rep, FL
"I’ve been training with Sebastian for 6 months, and the results have been amazing! My goals were to lose some weight, build muscle, and just feel fitter overall, and I can already see such a difference. Beyond the physical changes, working out with him has really helped me maintain a healthy mental state too.
I used to hate working out in the gym, but he completely changed my mindset. Now I actually enjoy every session and look forward to them! He’s incredibly knowledgeable, always motivating, and makes every workout fun. I leave the gym not only feeling stronger, but also proud of myself.
On top of that, he’s also a certified stretch therapist. We do short stretches after every workout plus a 60 minute stretch session weekly, which has made a huge difference for my recovery. Since I work 12 hour shifts, stretching has been a game changer for soreness and overall well-being.
I’m so grateful for his supportive approach and would highly recommend him to anyone looking for real results, both physically and mentally."
Stacci Dawkins, FL
"Listen... I was this close to booking a consultation for plastic surgery — flabby arms, a big ol' belly, muscles that had gone missing since 2022. Then in met Sebastian — the youngest personal trainer I’ve ever worked with, and easily the BEST. Six months in, and I’m looking in the mirror like, “Who’s that shredded Greek statue??” Oh wait — it’s ME!
He’s not just passionate, knowledgeable and focused — this man trains with a positive, uplifting aura that makes you feel like a superhero in leggings . Never late (not even once in almost a year!), always on point, and don’t even get me started on the stretching sessions — it’s like he’s got healing powers in his hands! I leave feeling like a brand new human, possibly from Wakanda.
Incredible results, humble personality, and honestly… at this point I think he might be part magician. If you're ready to cancel your surgery and start sculpting with sweat instead —this is your guy. 10/10.
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Natalia Fediushko, FL
"I've been training with Sebastian for over seven months, focusing on weightlifting and stretching, and the results have been truly transformative. My sleep quality, endurance, resilience to stress, and overall physical and mental health have all improved significantly under his guidance.
Sebastian is very knowledgeable about strength training, recovery, and mobility, and he tailors each session to meet my individual needs. His encouraging approach and enthusiastic attitude keep me motivated, even on tough days. He demonstrates great professional ethics and is always flexible with scheduling, making it easy to stay consistent with training.
Most importantly, Sebastian creates a positive and supportive environment where I feel challenged yet confident in my progress. I highly recommend him to anyone looking to improve their fitness, health, and overall well-being."
Ready to build strength, improve mobility, or increase flexibility? Fill out the form down below to schedule a FREE consultation for private personal training or stretch therapy and get 50% off your first session.