Free Tool

Coach Karl

Fat Loss Roadblock Finder

2-minute free assessment to find out what's holding you back from losing more body fat.

— Coach Karl

The Fat Loss Roadblock Finder

Lose the weight. Keep it off.
For Busy Professionals Ready to Lose the Weight and Keep It Off

Lose Your Next 40 Pounds in the Next 6 Months and Keep It Off With a System Built Around Your Life

No extreme diets, endless cardio, or overwhelming workouts. I teach a sustainable, attainable approach to weight loss.

How The Program Actually Works.

Here is how my coaching works from day one: we start with where your body is now, then build the plan around your life, your history, and the outcome you actually want.

Coach Karl - All4Fit
/ Your Coach Karl Mergille Owner · Head Coach · All4Fit

Coaching Built From Real Experience.

Eight years coaching online. Over 1000 clients. Two torn ACLs in the same knee. I built All4Fit because I understand what it feels like to lose the version of yourself that used to feel strong, capable, and in control of your own body.

The goal is not to punish your body back into shape. The goal is to rebuild it the right way so you can get leaner, stronger, and more confident without breaking yourself down again.

  • 8+ years coaching online since 2019
  • 1000+ clients coached across different starting points
  • 5.0 rating across verified Google reviews
  • Real experience rebuilding after injury, setbacks, and years of frustration

One on One Coaching Built Around You.

My job is to build the plan around your actual life: your schedule, your food habits, your injuries, your stress, your equipment, and what has been getting in the way.

Some clients start by tracking. Some do not. Sometimes the first step is as simple as sending me pictures of your meals so I can help you make better decisions without overwhelming you. From there, we build consistency, then precision.

  • Custom training built around your body and history
  • Nutrition coaching that fits your life instead of taking it over
  • Weekly check-ins with real adjustments based on what happened
  • Direct support when you hit a wall or start second guessing

Built For The Next 30 Years.

Most programs are built for a quick 12 week push. Then life happens and you start over again.

All4Fit is built for busy professionals who want the energy, strength, and structure to stay in shape for good. No more all-or-nothing cycles. No more January restarts. No more feeling like the weight is something you will always be fighting.

  • Sustainable habits that hold up when life gets busy
  • Smarter training that works around old pain and weak points
  • Strength and conditioning that carry into real life
  • A framework so you do not have to keep starting over

One quick note on what actually causes weight loss. It is usually not about finding the perfect diet. It is about the habits you already know are holding you back, the overeating, the late night snacking, and leaning on cardio as your only form of training. Strength training is what actually builds the muscle that drives long term fat loss, paired with eating in a way you can sustain and still enjoy. You do not need to train 6 or 7 days a week to get there. Most clients see real results training 3 to 4 days a week for 45 minutes, whether that is in a gym or at home.

/ Coach Karl · 1-on-1 Coaching

How We Lose The Weight.

Training tailored to what your body can actually handle right now, and we build on that over time. Nutrition built around real food, not extreme dieting. Accountability from an actual coach, not a generic app. I guide you, push you, and show you exactly what needs to change in your life to make this work, so you can lose the weight, move better, rebuild your confidence, and stay ready for life for the next 10, 20, to 30 years, not just the next 30 days.

  • Tailored training built around your current body and what you can handle right now
  • Nutrition that fits real life so you can lose the weight while still eating foods you enjoy
  • Daily check-ins that remove the guesswork and keep the plan moving
  • Direct text access so you get answers before small problems turn into setbacks
  • Mobility and joint work to help your body move and feel better
  • Accountability that actually checks in, if you disappear, I will reach out
  • Conditioning built for real life so you can keep up with your day without getting winded
  • A long-term framework that ends the start-stop cycle and helps you lose the weight and keep it off for good
Apply now 1 on 1 Coaching Application
Real Clients · Real Weight Loss

Over 250 clients have lost 25+ pounds and kept it off.

/ Watch The Stories

Hear it straight from people who have done this.

/ Story 01Watch
/ Story 02Watch
/ Story 03Watch
/ Story 04Watch
/ Google Reviews · 5.0 · Verified Clients
Real Wins

The wins they came for.

Not just the training plan. Not just the macros. These are the outcomes clients actually wanted: weight loss, confidence, less pain, better movement, and the feeling of being themselves again.

/ Quick Win 60 Sec
"I lost 40 lbs in 6 months and feel 10 years younger."
"I lost 30 lbs while still eating my favorite foods."
"I can finally play hockey on Thursdays without my back hurting."
"I got jacked doing less than I was doing before."
"I'm back on the field playing softball again."
"I walked into the Coast Guard in 4 months."
Real questions

The questions busy people losing weight actually ask.

Yes. The program is built for people who have not trained seriously in years or have not stayed consistent in a long time. We do not start where you used to be. We start where you are right now and build back up the smart way. Most clients are coming back after years of inconsistency, weight gain, or life getting in the way.
Yes. This is one of the biggest reasons my coaching works for busy adults trying to lose weight without adding more pain to their day. I tore my ACL twice in the same knee, so I understand what it takes to rebuild around real limitations. Your program is built around your specific limitations, not against them. We strengthen what has been weak, improve how you move, and stop forcing your body through training it is not ready for.
Most clients train 3 to 4 days per week for about 45 minutes per session. The goal is not to bury you with more work. The goal is to build the right plan so you can stay consistent, recover, and keep progressing even with a busy schedule.
Both work. If you have a gym, great. If you train at home, we build around the equipment you have. Your equipment does not decide your results. Consistency, progression, and coaching do.
We talk pricing after I review your application and know whether I can actually help. It is not the cheapest coaching out there, and it is not built to be. This is for people who want coaching, accountability, and a real plan built around them.
YouTube gives you exercises. Coaching gives you a plan, adjustments, accountability, and someone who can help you make the right decision when life gets messy. The difference is not just the workout. The difference is having someone coach you through the process.