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AI strength training app · conversational coach · free beta

Your AI strength coach.
Train for life.

Log workouts in chat. Get plans that balance strength, endurance and injury risk — built for training past 40, with the equipment and time you actually have.

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· Plans built around you · Progress tracked across movement · Free during beta
A conversation with your coach
I have 30 minutes and my left shoulder feels tight.
Let’s keep overhead work light today. I’ve built a session around mobility, pulling strength and a gradual return to pressing.
Your history · Your equipment · Your next session
No empty dashboard to maintain.
Just tell it what happened.
Then let the system help you decide what’s next.
Scroll →
What you get in five minutes

From workout log to next plan.

01
Log in conversation

Tell your AI coach what you did. No spreadsheet or perfect format required.

02
See what it means

Your training is mapped across movement planes, strength and endurance.

03
Get your next session

Receive a practical plan that respects your recent load, readiness and goals.

01 · Why 5bar

You don't need another dashboard.

You need to know what to do next.

Log what happened.
Understand what it means.
Let the next session follow from there.
The usual fitness app
  • Steps walked
  • Calories burned
  • Resting heart rate
  • Recovery score (whatever that is)
  • Streaks. Rings. Badges.
Lots of numbers to check. Very little guidance for the workout in front of you.
What 5bar does instead
  • Load through eight movement planes
  • Strength per plane, tracked over time
  • Acute load vs the chronic base you've built
  • Distribution: what you're overusing, what you're neglecting
  • One number: are you progressing, or aren't you?
You get the useful part of a coach's thinking, without maintaining a training spreadsheet.
"I told my coach what happened. It already knew what to change next." — the 5bar loop
02 · Strength training for longevity

Train for the life
you want to keep living — especially after 40.

The point isn't to win a fitness score. It's to keep your options open: strength, endurance and mobility that carry into ordinary life.

Your coach keeps those inputs in view, then turns them into a session you can actually do today.

Strength
01
The ability to apply force when you need it — picking up a grandchild, catching yourself on the stairs, putting groceries on a high shelf.
Endurance
02
The capacity to keep going. Walking five miles. Climbing four flights. Carrying weight without your heart deciding it's done.
Efficiency
03
Volume delivered per minute of training time. The difference between sustainable, high-quality work and wasted effort. It's what turns raw capacity into real capability.
"I want to look good in a swimsuit" is not a fitness goal.
"I want to lose 10 pounds" is not a fitness goal.

Those are flaky, ephemeral, and disappear the week you eat a slice of cake. The body doesn't measure itself in inches around a waist. It measures itself in what it can still do.

5bar keeps the bigger goal in view. You only need to show up for the next useful session.

Built for
Average Joe Average Jane Recovering desk-worker Training past 40
Scales for
Serious lifters Endurance athletes Climbers, runners, fighters

Same engine. Same science. Different pace.

03 · How your coach works

Tell it what happened.
Get a better next session.
Keep going.

Every workout you log gives the coach more context. It watches three training inputs and eight movement planes, so its suggestions become more useful as you build a history.

01
Strength
kg, peak load

Peak load expressed through movement planes. Heavier lifts in isolation are noise; force you can deliver across planes is capability.

02
Endurance
kg, total volume

Total work delivered in a session. Sets × reps × weight. The capacity number.

03
Efficiency
kg / min · efficiency

Volume per minute of training time. Force delivered quickly. The number that separates good training from long training.

turns context into →
Your next session
A practical recommendation that reflects what you have done, what you have available, and what your body is ready for.

Not a generic template. Not a score to chase.

A useful next step.
The eight movement planes

Push · Pull · Press · Hinge · Squat · Side Squat · Twist · Run

Every exercise in your log belongs to exactly one plane. No double-counting, no overlap. Over four weeks, the system watches the distribution and tells you which planes are under-trained, which are spiking, and which to load next.

Strength without mobility is brittle.
Endurance without efficiency is wasted.
Mobility without strength leads to collapse.

Six planes of movement, hand-drawn
From the principles deck — six of the eight planes, drawn by hand.
04 · The thinking underneath

The science stays underneath.
The useful answer stays up front.

5bar uses established training ideas to make its guidance more thoughtful. You don't need to learn the terminology first; the coach does the translating.

Concept 01
Acute : Chronic Workload Ratio

Your acute load is what you did this week. Your chronic load is what your body's used to over the last four. The ratio between them tells you whether you're growing — or asking for an injury.

< 0.8×
Under
Nothing changes
0.8 – 1.3×
Sweet spot
Adaptation, no injury
> 1.5×
Risk
Injury climbs fast
Hulin, Gabbett et al. British Journal of Sports Medicine, 2016. Studied across 400+ elite players, two full seasons.
Concept 02
Movement Patterns, Not Exercises

Dan John and Gray Cook spent decades arguing that the body doesn't care about exercises — it cares about patterns. A swing is a hinge. A push-up is a push. The same load distributed across the same plane.

5bar bakes that in. Every exercise belongs to one plane. Coverage is what gets measured, not exercise variety.

Concept 03
Distribution Beats Volume

Two people can do the same total weekly volume and have completely different fitness outcomes. The difference is where the load went. Was pull neglected? Was hinge spiked? That's the signal almost no tracker shows you.

Volume tells you how much.
Distribution tells you whether it's working.

You can inspect the reasoning whenever you want. Otherwise, the coach handles the day-to-day — it tells you what to do next based on everything it knows about you.

05 · Why the coach is useful

Personal context in.
Useful guidance out.

The best technology disappears into the experience. You shouldn't need to understand the machinery to get a better answer.

Underneath the chat, 5bar runs a stack of specialised LLMs — different models tuned for different jobs. One reads your logged workout and classifies every set across the four vectors. Another generates the next session given your last four weeks, your equipment, and your fatigue state. Responses in the coach chat are written in plain English by the system. Each one is fed prompts built from real sports-science literature, not the public internet.

The coach is a chat. You talk to it directly — ask questions, log what you've done, get plans, adjustments, and daily guidance. But it's not a generic chatbot. Every reply is generated by the same specialised system: it knows your full history, your equipment, your recent stress and fatigue, and the science. The chat is the interface; the models are the coach.

"What should I do today?"
Ask once. The coach already has the context.

Quietly running underneath
  • Multi-model LLM router · job-specific tuning
  • Sports-science prompt corpus · papers, not blogs
  • Per-vector load model · ACWR + 28-day baseline
  • Plane-distribution analyser · 8-pattern coverage
  • Assessment generator · diagnostic, then guidance
  • Equipment-aware planner · works with what you own
  • Stress-profile classifier · per logged session
None of it visible. None of it editable. All of it accountable.
06 · Meet the coach

One conversation.
Your whole training system.

Talk naturally. Log a session, ask what to do next, or get an adjustment when the day changes. The stats are there when you want the deeper picture.

Start with what you already do

A handwritten log is enough.

This is a real workout note: warm-up, kettlebell clean and press, skips, curls, and a finish time. You don't need to format it perfectly before the coach can help.

Send the messy version. 5bar turns it into training context, spots the pattern, and helps you decide what comes next.

Human input → useful context → better next session
Handwritten workout log with warm-up and exercise notes
Close view of handwritten kettlebell and dumbbell workout details
5bar coach chat interface
01 Coach chat Conversational interface. Message the coach, attach files, get plans and guidance.
5bar your stats
02 Your stats See the patterns behind your progress when you want the big picture.
5bar guidance and dock
03 Guidance & dock Your plan and context stay close while the coach guides the session.
07 · Principles

Want to understand the method?

The coach is conversational, but the thinking is transparent. These short pieces explain how 5bar measures progress and makes decisions.

01
The Four-Vector Model
Every session is scored against four fixed vectors. They define what progress means and keep every workout accountable. Strength must transfer across movement — isolated outputs are noise.
Measurement · 3 min read
02
How to Scale Right
Training load is a double-edged sword. Too little and you stall, too much and you break. The science of the acute:chronic workload ratio gives you a framework that actually works.
Scaling · 6 min read
03
Body Trains in Patterns, Not Exercises
The body doesn't care about exercises. It cares about movement. Understanding how stress distributes across patterns is the key to balanced, sustainable training.
Movement · 5 min read
04
Why 5bar
Fitness became a scoreboard of steps and calories, but activity by itself changes nothing. 5bar reveals the system that is already there — so you can train with intent.
Philosophy · 4 min read
5bar

Your next session
starts with a conversation.

Free during beta · Google sign-in · Start with what you have and where you are today.

OR

5bar is in beta — free for now, no strings attached. Your first plan starts with a conversation.