Your training, and everything around it.
Eccentric records what you do in the gym — then connects it to the rest of your life, so your training isn't stranded in its own app.
Record every workout
Log any lift on any equipment — plans, history, and real progress in one place. Check off your sets as you go, or import a workout file. No spreadsheet, no setup.
Connect your wearable
Bring your recovery in — sleep, heart-rate variability, and readiness — and read your training right beside how recovered you were. Honest signals, never invented causation.
It lives on your calendar
Schedule your training and it shows up in the calendar you already use. Subscribe once, and every planned session is just there — with the day's plan attached.
Ask your AI assistant
Connect Eccentric to an AI assistant like Claude or ChatGPT over MCP and ask about your training in plain language — your trends, what to do next, even plan changes to approve.
Design your training together.
Train with a coach or a crew — share your plan, work on it together, and decide exactly what everyone can see.
A coach writes the plan. You both shape it.
Invite a coach to author your program, then refine it side by side. A coach can propose changes without overwriting your live plan — you accept, edit, or decline each one. Every change is tracked, so the plan is a shared, living thing, not a PDF emailed back and forth.
Share what you want — keep the rest private.
A coach can write your plans and review your sessions without ever seeing your sleep, heart-rate variability, or bodyweight. Bring a training partner in for a second opinion, too. Access is granted one kind at a time, and you can change it whenever you like.
A look inside.
A few of the things Eccentric keeps in one place.
Your recovery, beside your training.
Connect your wearable and read sleep, heart-rate variability, and readiness next to what you actually did — honestly, never as forced cause-and-effect. Your recovery data stays private to you.
Your week, on your calendar.
Plan your sessions and subscribe once — every workout shows up in the calendar you already use, and stays in sync as your plans change.
It meets your gear where it is.
Eccentric plugs into the equipment and tools you already use — and there's a page for each.
Voltra
Read every rep your Voltra I measures — range of motion, bar speed, power, and the eccentric phase — as progress you can actually see.
ExploreOura
Connect your ring and your sleep, HRV, and readiness fill in automatically — right beside the training they help explain.
ExploreAI assistant
Link Claude or ChatGPT over MCP and ask your training anything — trends, history, what's next, even plan changes to approve.
ExplorePlus calendar sync, CSV import and export, and more sources on the way.
Native apps for iPhone & Android.
A logging flow built for the ten seconds between sets, plus a home-screen widget for your next workout. They're in testing now — sign up, ask for the one you want from Settings, and we'll email you an invite when a build is ready.
Four steps, no new habits.
Keep training the way you already do. Eccentric is everything around the session.
Plan it
Author a program yourself, or have a coach write one for you. Self-coached is the default — no setup required.
Train your way
Lift the way you already do. Check off each set as you go — or let a smart trainer capture every rep for you.
Bring it together
Eccentric fills your session with the real numbers, pulls in your recovery, and puts the next workout on your calendar.
See what changed
Per-workout progress and trends over time — read honestly, never as false certainty.
Straight answers.
Do I need any special equipment?
No. Log barbell, dumbbell, and machine work with plans, history, and strength tracking. If you train on a smart trainer, per-rep features like bar speed and power simply light up on top.
Can I bring in my wearable's data?
Yes — your sleep, heart-rate variability, and readiness sit right beside your training, so you can see how recovery lines up with performance. More wearable connections are coming soon — if there's a particular one you want, get in touch and tell us.
How does the calendar part work?
Schedule your sessions in Eccentric and subscribe to your training calendar once. From then on, each planned workout shows up in the calendar app you already use, with the day's plan attached.
What's the AI assistant connection?
Eccentric connects to AI assistants so you can ask about your training in plain language — your trends, your history, what to train next — from the tools you already use, with access scoped to exactly what you allow.
Can a coach see my sleep and recovery data?
Only if you let them. Writing your plan and seeing your recovery data are separate permissions. A coach you invite gets exactly what you grant — nothing more — and you can change it anytime.
Can I share a workout with someone who doesn't use Eccentric?
Yes. Any session you've done can be shared as a public page — the exercises, every set, the totals, and any records you set. It's a snapshot, so editing the session afterwards doesn't rewrite a link you already sent, and your sleep, recovery and bodyweight are never on it.
Why is it called Eccentric?
The eccentric is the lowering phase of a rep — where a lot of the adaptation, and a lot of the interesting data, lives. It's a fitting name for a tool that pays attention to the details most apps ignore.