TrainFury
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The problem Smart progression Missed days Two modes FAQ Exercises Start free
Free to use

Most apps just log your workouts. TrainFury tells you exactly what to do next.

TrainFury plans your workouts, picks the right weight for every set, tracks your progress, and reshuffles your week if you miss a workout.

Start free See how it works
No card, no trial 870+ exercises Works offline
TrainFury telling you to lift 92.5 kg for 6 reps on your next set of bench press
  1. Set 1 prescribed 92.5 kg for 6 reps. You log 7 reps at RPE 6.5. The set was easier than the target, and there is room left in the rep window, so the coach holds the weight and raises set 2 to 8 reps: “Looked easy, same weight, aim for 8.” Those 7 reps also estimate a 114.1 kg one-rep max, beating your 107.9 kg best.
  2. Set 2 is 92.5 kg for 8 reps. You log 8 reps at RPE 9. That ran hotter than the target, but cutting reps keeps set 3 inside the rep window, so the weight holds again: “That ran hot, same weight, cap it at 6.”
  3. Set 3 is 92.5 kg for 6 reps. You log 5 reps at RPE 10. A set that hard cannot be fixed with reps, so the coach cuts the load by its 10 percent limit to 83.25 kg, snaps that down to 82.5 kg because that is what the plates can actually make, and adds 45 seconds of rest: “Last set was a grinder, next 82.5 kg and take the extra rest.” Set 4 becomes 82.5 kg for 5 reps, and the session finishes 1,850 kg of volume against last time’s 1,750 kg.
870+
Exercises with step-by-step guidance
Instant
PR detection for 1RM, best set and volume
Adaptive
Auto-rebuilds your week when you miss sessions
$0
Free AI plans and offline-first tracking
Why training breaks

Training usually breaks in two places.

People stall, or they fall behind. Both happen quietly, and most apps only record that it happened.

I stopped getting stronger.

The numbers go flat and nothing tells you. You only find out weeks later, after the stall has already settled in.

A logger keeps the history and leaves the reading of it to you. It will not tell you a lift has stopped moving, or which variable to change.

You need better programming
I missed too many sessions this week.

Work ran late on Monday, you were wiped out on Tuesday, and suddenly the week does not fit the plan anymore.

A fixed program desynchronises in silence. A streak app marks the miss and breaks the run, which is a reason to quit, not to come back.

You need the week to bend

TrainFury has real machinery for both. Here is what each one does.

TrainFury flagging a new 1RM record of 111 kg immediately after a set is logged, with a green best estimated 1RM bar

What should I lift next?

TrainFury gives you a target for every set, updates it when you outperform it, and eases off when the lift is moving the wrong way.

Starting a new exercise? It uses what it already knows about your strength to suggest a sensible first weight, then adjusts from there.

  • Always know the number you are chasing on the next set
  • Catch new personal bests the moment you hit them
  • Only shows weights your gym can actually load
TrainFury exercise history for Barbell Squat, listing each past session with the weight, reps and volume of every set and a star on the best one
The recordEvery set you have done on the lift.
TrainFury estimated one-rep max chart for Barbell Squat climbing from 93 kg to 165 kg over ten months, with a tooltip on a 125.4 kg point
The trendTen months of sets, one line.
TrainFury post-workout summary confirming you overloaded, followed by next time targets for incline dumbbell press, bench press and weighted pull ups
The instructionNext week’s numbers, from what you logged.
Progressive overload is arithmetic on last week’s set. Tap the set in and TrainFury has already done it: the record is kept, the personal record is flagged, and the answer is waiting on next week’s target.
When you miss days

Missed a few days? TrainFury reshapes the week for you.

If the sessions you planned no longer fit, it condenses what is left into something you can actually finish.

Monday, missed TrainFury coach tab showing Monday marked as missed and a heads up card offering to make the remaining workouts fit
It catches the problem early and shows you the revised week before you commit. The week no longer fits the days left.
One tap later TrainFury showing the rebuilt week: three workouts combined into two, with the new Friday session and its six exercises listed
Three workouts, rebuilt into two. Built around the days you have left.
TrainFury muscle distribution chart showing four muscle groups behind, comparing the sets your plan asked for against what you have done and what is left

See what each muscle still needs

TrainFury tracks the sets you have already done, counts what is still owed, and rebuilds the week around the days you have left.

If you trained extra on your own, it includes that too, so the revised week stays balanced instead of just shorter.

The easy stuff goes first. Warm-up sets are never dropped to make room, and they never count toward your progress.
  • See the full muscle breakdown, not just broad body parts
  • Block off closed gym days so nothing gets scheduled there
  • Review the revised week before you accept it

When progress stalls, TrainFury notices

It watches your lifts over time, spots when a lift stops moving, and shows you the numbers behind that call. Then it gives you a next step you can actually use, instead of leaving you to guess.

See which lift has stalled and why

TrainFury shows the numbers behind the call, so you can see whether the lift has actually stalled.

TrainFury coach's review saying several muscle groups are under-trained and a lighter week is recommended, listing the evidence for each point

Get a clear suggestion instead of a vague warning

Small fixes come first, so you can make the next change without overreacting.

TrainFury suggested actions offering an exercise swap and adding two sets each of middle back, chest and glutes, each with its own button

Start with the smallest change that could fix it.

TrainFury showing what your week trains: 98 sets across front and back anatomical maps, naming the muscles not trained directly
Free AI plans

Build a week around your goal

Tell TrainFury what you want, how many days you can train, and what equipment you have. It generates a full week for you to review before anything is saved.

You can see which muscles the week hits before you accept it, then ask for more or less of the work you care about.

  • Free to use, even for AI-generated plans
  • Keep your own routine if you already have one
  • Switch the coach off anytime and keep your history
TrainFury plan review screen showing a generated hypertrophy push pull legs five day split with day cards and exercise lists, not yet saved

The numbers stay exact

TrainFury uses deterministic calculations for the important stuff: your targets, your volume, your estimated strength, and what fits on the bar.

AI only helps with the choices and the explanation, then its output gets checked against the numbers your phone already computed.

That means you get the flexibility of AI without giving up the math.

Use it as a simple logger or a guided coach

Some people want to be told what to do. Some just want somewhere to write it down. TrainFury does both, and you pick in Settings.

Log mode

If you want to just record your workouts, Log mode gives you a clean place to enter sets with your history already in place.

TrainFury log mode home with three tabs, a 35 week streak, quick start and the saved routines list

Guided mode

If you want more direction, Guided mode lays out the week, sets your targets, and works around your schedule.

TrainFury training week editor with a workout assigned to each day, two days marked gym closed, and a note that the coach re-plans around days you miss
TrainFury Advanced Analytics showing front and back body maps coloured by muscle, with a list of sets and percentages for lats, chest, shoulders, triceps and more

See what you actually trained, and what you keep skipping

The body map shows every muscle you worked and how many sets it got, so missed areas stand out straight away.

Filter it by routine, by muscle, or by date range. The moment you finish a session, TrainFury tells you which lifts beat last time and which records you broke.

  • Track your lifting volume, reps, and training time over time
  • See every exercise record as you log it
  • Keep body measurements and progress photos together, privately

And the people who would notice if you stopped

TrainFury home feed showing a followed athlete's Pull session with a workout photo and its duration, exercises, sets and volume
See what they liftedYour training partners’ sessions. No strangers, no algorithm.
TrainFury head to head comparison between two athletes showing a win tally and last 28 day rows for workouts, time trained and volume lifted
Head to headYour last 28 days against theirs.
Being seen should be your choice. Your account can be private, follow requests are yours to approve, and progress photos are never shown to anyone but you.

More around the workout

A few more features that matter when you are actually training.

  • Rest timer
  • RPE logging
  • Warm-up sets
  • Drop sets
  • All-out sets
  • Consistency widgets
  • Dark mode
  • Workout sharing
  • Routine sharing
  • Adaptive progression
  • Plateau detection
  • Auto-condensation
  • Guided mode
  • Gym mode
  • Automatic PRs
  • Per-muscle analytics

Make progress in three simple steps

No guesswork, no spreadsheets, no personal trainer to pay. Just this.

1

Create a plan

Build your own from 870+ exercises, pick a ready-made routine from fitness experts, or answer eight quick questions and let our AI write your week for you. Any of the three takes minutes.

2

Log your workouts

Tap in your sets as you lift. Last week's numbers are already on screen, the rest timer runs itself, and everything works with no signal in the basement gym.

3

Analyse and progress

Read the charts yourself, or let our AI read them for you. It catches every personal record, spots what has stalled and tells you exactly what to lift next time.

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What the research says

Why the method holds up

Two findings on writing it down, two on not doing it alone. None of them is a TrainFury result.

Watching the number moves it138 studies · 19,951 people

Prompting people to monitor progress made them measurably more likely to reach the goal, and the effect was stronger when progress was physically recorded than when it was only noticed.

Harkin et al., Psychological Bulletin, 2016 · meta-analysis

Only one bench movedsix weeks · +9.5 kg vs nothing

College footballers ran six weeks of either a fixed written plan or one where every session’s load was set by what they actually lifted last time. The adjusted group put about 9.5 kg on their bench press. The fixed plan added nothing.

Mann et al., J Strength Cond Res, 2010 · autoregulation trial

More reps with someone watching+4.5 reps · and it felt easier

Lifters took three sets to failure with a spotter either standing over the bar or hidden out of sight. In plain sight they got 4.5 more reps and 210 kg more total load from the same session, and rated it easier, not harder.

Sheridan et al., J Strength Cond Res, 2019 · spotter deception study

Training is contagious1.1M runners · 350M km · five years

Across a global network of runners, exercise proved genuinely contagious rather than merely correlated: when the people around you train more, you train more.

Aral & Nicolaides, Nature Communications, 2017 · exercise contagion

Worth reading the limits with the findings. These are behaviour change and endurance trials, not muscle growth trials, so what carries across is the adherence mechanism, not a promise about your results.

Questions people ask before they switch

Does keeping a workout log actually make a difference?
Yes, and for lifting the reason is more concrete than general habit building. Progressive overload is arithmetic on last week’s set, so without the record there is nothing to add to. The behaviour change literature points the same way: a 2009 meta-regression across 122 diet and exercise programmes separated the ones that worked from the ones that did not by a single technique, self-monitoring, and a 2016 meta-analysis of 138 studies found the effect grew stronger when progress was physically recorded rather than merely noticed, and stronger again when it was reported to someone else. Those are behaviour change and weight loss trials rather than muscle growth trials, so what carries across is the adherence mechanism, not a promise about results.
Is TrainFury really free?
Yes. Logging, routines, the exercise library, PR detection, analytics and AI plan generation cost nothing, and there is no card at signup. The AI features carry allowances on a rolling window rather than a paywall: one plan, one fine-tune, two week rebuilds and one coach review. Generous enough to feel free, bounded enough that we can keep running it.
Can I bring my history over from Hevy or Strong?
Not yet, and it is worth knowing before you switch. There is no import, so you start with an empty history, and the progression engine needs a few sessions on a lift before its prescriptions mean much. Expect the first week or two to be plain logging while it learns your numbers.
If AI is involved, how do I know the numbers are still right?
It is not asked to. Estimated 1RM, set targets, weekly volume, what each muscle is owed and which plates are loadable are all computed on your device with ordinary deterministic maths. The model picks between options and explains them in words, and its reply gets clamped back onto the computed figures before you ever see it.
What devices does it run on?
Android through Google Play, and an installable web app at app.trainfury.com that runs on iOS and any modern browser. Same account and same data across all of them, so you can log on your phone and read the analytics on a laptop.
Do I have to use the coach?
No. Log mode is plain tracking and nothing in it tells you what to lift. You can switch between the two modes in Settings whenever you want, in both directions, and nothing you have logged or built changes when you do.
Can I log a workout with no signal?
Yes. Log offline and TrainFury syncs once you are back online. Basement gyms are fine.
How private is any of this?
Set your profile to private and new followers have to send a request you approve. Progress photos are private always, with no setting to get that wrong. Your height and bodyweight are used to size your starting weights and never appear on your profile or in anything you share.
Does it track cardio?
Barely. Time and distance sets exist, but this is built for lifting and the engine only reasons about loaded work. If cardio is the main thing you want tracked, another app will serve you better.

Start lifting with a plan

Create a free account, get your first workout logged in minutes, and let TrainFury adjust when your week goes sideways.

Install the TrainFury web app on iOS Get it on Google Play

Use the web app in any browser, or install it if you want it on your phone.