JASONSENTENO
Build muscle. Burn fat. Develop the mindset that keeps you consistent. Real coaching. Real results. No guesswork.
About Jason
Hello and congratulations on taking the first step to becoming the best version of yourself! I'd love to be the one who guides you on this journey.
I take a different approach to training — I like to develop your mindset first, at the same time getting you in the physical condition that you can be proud of. Feel free to ask me any questions you might have. I look forward to meeting you and getting started!
Train Your Way. Get Results.
Whether you prefer in-person coaching, online training, or group energy — there's a program designed for your lifestyle.
Private Personal Training
One-on-one sessions tailored specifically to your goals, fitness level, and schedule. Get personalized programming, real-time form correction, and the accountability that drives real results.
- Custom workout plans
- Form & technique coaching
- Progress tracking
- Flexible scheduling
Online Personal Training
Train anywhere in the world with the Fortitude Fitness App. Structured workouts, proven training splits, and real coaching guidance — all in your pocket. At-home or gym options available.
- App-based workouts
- At-home + gym options
- Weekly check-ins
- Nutrition guidance
Group Bootcamps
High-intensity group training sessions that build strength, burn fat, and create community. Push your limits alongside others who share your drive and determination.
- High-intensity training
- Community atmosphere
- All fitness levels
- Motivating environment
The Fortitude Fitness App
Get full access to the Fortitude Fitness training system. This isn't random workouts — this is a system built for real results. Track your progress, follow your plan, and experience what it's like to train with purpose.
"No guesswork. No wasted time. Lock in. Execute."
- Structured workouts — at-home + gym options
- Proven training split for muscle & fat loss
- Progress tracking & performance metrics
- Weekly check-ins with real coaching guidance
- Available on iOS & Android
Full access to the training system — completely free for 3 days. Includes weekly check-in session credit.
Client Transformations
These aren't stock photos. These are real people who committed to the process — and got real results.
Body recomposition — leaner, stronger physique
Incredible strength & muscle definition gains
Significant fat loss & posture improvement
Body fat reduction & muscle definition
Dramatic physique change — fat loss & muscle gain
Strength gains & visible muscle development
Toned physique & improved body composition
Side profile — visible fat loss & posture correction
Full body transformation — leaner & more defined
Massive weight loss — completely transformed physique
Ready to write your own transformation story?
Start Your Free TrialWhat Clients Say
Real Results,
Real People
"Coach Jason is an incredibly talented personal trainer and one of my top favorites I've worked with. He's very attentive during strength training sessions, prioritizes injury prevention, and truly listens so he can adapt workouts for all fitness levels, including beginners. He strikes the perfect balance between being patient and pushing you to grow without ever making you feel discouraged. Instead, he creates a supportive and motivating fitness coaching environment that makes training feel sustainable and enjoyable."
Diana Spinella
"Jason is amazing. His motivation is the success of his clients. I went to him to help me lose weight and to learn the proper way to workout. Not only did he help accomplish losing 50+ pounds and still losing. He has taught me all about how to eat properly and supplements. He practices what he preaches. Jason has turned my life around and at age 56, I feel amazing. He truly prides himself in making sure you accomplish your goals."
Tina M.
Lakewood, CA
"Been training with Jason via virtual training app, and weekly zoom meetings going over goals, progress etc. Let me tell you, not only is it much less expensive than a personal trainer, but the results were 10x better. He really dives into your goals and creates a plan that actually works."
Emanuel Shaker
"I cannot speak highly enough about Jason! From the moment I started working with him, I knew I was in good hands. His expertise and dedication to his craft is truly remarkable. Not only have I seen incredible results in my fitness journey, but I've also gained invaluable knowledge about exercise and nutrition. Jason takes a personalized approach to training — tailoring each session to my specific goals and needs. Highly recommend Jason if you're looking for a trainer. He is the BEST."
Caroline J.
Santa Monica, CA
"I'm so glad I found Jason through a friend that was training with him! Our hard work has given me more strength and confidence in and out of the gym. As long as you show up for him, he will show up for you AND THEN SOME. 100/10 — HIGHLY RECOMMEND."
Stephanie Ogie
"Jason's training style is very effective and he knows how to push his clients to their fitness goals safely. I have never felt better since starting with Fortitude!"
Ryan S.
Long Beach, CA
"Jason has been the perfect motivator to create change in my life. His tenacity is inspiring and his drive to live a healthy happy life mentally, physically and spiritually is compelling. He's been thoughtful in tapering my milestones to help me achieve my goals in a sustainable way."
Erin Antes
"Love training with Jason! He keeps me in line and after a month, I'm already seeing amazing results! Can't wait for more! Sign up — you won't regret training with him!"
Jenee C.
Lakewood, CA
"My experience with Fortitude Fitness has been awesome! The owner is a great guy that knows what he's doing when it comes to fitness! If you're looking to lose weight and become a new you, I would highly advise giving him a call!"
Dakota Nelson
"Started with a 3-month program. Very strict diet and workout plan put in place. Jason walked me through literally every step of the process to achieve my goal — getting lean and shredded. Three months go by and I'm in the best shape of my life. Jason is your go-to man if you're looking to completely change your body, or just want to lose weight. He's extremely knowledgeable with proven results."
Emanuel A.
Phoenix, AZ
"Jason is very attentive and builds my workouts around my physical restraints. He is very knowledgeable about fitness and nutrition. Jason is encouraging and really supports me throughout my fitness journey. So happy I found Jason as a trainer."
Deborah C.
Long Beach, CA
Knowledge Is Power
Training insights, mindset strategies, and programming tips from Jason.
Why Lifting Ugly is Killing Your Hypertrophy
Have you ever seen someone at the gym moving weights like they're auditioning for a Fast & Furious stunt scene? Back bending like a fishing rod, knees wobbling like a newborn deer... That's not beast mode. That's a physical therapy appointment pending.
Read More
The Mindset Shift That Changes Everything
Before you can transform your body, you have to transform how you think about training. Discipline isn't about motivation — it's about building systems that work even when you don't feel like it.
Coming Soon
At-Home vs Gym Training: Which is Right for You?
The best workout is the one you'll actually do. We break down the pros and cons of both environments and how the Fortitude Fitness system adapts to wherever you train.
Coming SoonReady to Fortify Yourself?
Take the first step toward becoming the best version of yourself. Start with a free 3-day trial or book a consultation with Jason today.