Simple workout tracker

Strengthen is a simple workout tracker. Log every set at the gym, keep your machine settings handy, and watch months of effort turn into a line that goes up.

Start trackingSee how it works

Built by one person to track his own progress. Free to use.

Show up

Every square is a day you turned up.

Strengthen keeps a calendar of every session. Miss a day and it’s fine: the grid rewards coming back, not being perfect. Add a little each time and the numbers take care of themselves.

Sessions
123
Weeks
26
Top set
+15kg
SessionRest day, fills itselfAn example first six months
How it works

Three steps between you and progress

  1. 1Log the setWeight and reps, then one tap: heavier, same or lighter next time. Next session Strengthen fills in what you lifted last time, so all you have to do is beat it.
  2. 2Remember the machineSeat on 4? Pad on 3? Keep a settings note on every exercise so you stop fiddling with levers and start lifting.
  3. 3Watch the trendCharts by exercise, set and metric, in kg or lb. Back-enter the numbers you remember and your history starts from day one.
Features

Everything you need. Nothing you don’t.

Built around the habit that actually works: show up regularly and add a little each session.

  • Last time, filled in

    Every set starts at what you lifted last session, so the only job is to match it or beat it.

  • A verdict on every set

    Heavier, same or lighter next time. One tap, and your future self knows exactly what to do.

  • Machine settings notes

    Seat heights, pad positions, grip. Kept on each exercise, right where you need them.

  • Back-enter your history

    Add the numbers you remember from before, so your trend lines go back further than your first log.

  • Trends that tell the truth

    Chart any exercise by set and metric. Weights stay as you entered them and convert to kg or lb for display.

  • Rewards turning up

    A consistency grid that fills in every time you train. Showing up regularly is the whole game.

  • Works with no signal

    Gym basements are dead zones. Log offline and your sets sync once you’re back online.

  • Phone at the gym, laptop at home

    Big tap targets for between sets, and a wide view for digging through your progress later.

  • Routines ready to go

    Start from a programme preset or build your own routines, then tweak them as you grow.

Why I made it

Made for my own goals. Shared for yours.

Hi, I’m Henry.

I built Strengthen myself, for my own fitness goals. I wanted one place to log every set, remember where the seat goes on each machine, and see honestly whether I’m getting stronger over months, not just from one session to the next.

It happens to be free to use right now. If it helps you track your progress too, that’s the best outcome I could hope for.

Got a suggestion? Please send it. I read every one and I’ll do my best to build the requests that help people reach their fitness goals.

Henryhenners.io

  • kg/lbLog in whatever the machine says. Trends convert for you.
  • 1Person building it: me, for my own training first.
  • YouDecide what gets built next. Ideas welcome.
Suggestions welcome

Got an idea? Tell me.

Strengthen grows with the people using it. Suggestions are genuinely encouraged: send me what would help with your training and I’ll do my best to build it, so it helps others with their fitness goals too.

Suggest a featureGet help
  • A rest timer between sets?
  • Plate maths for the barbell!
  • Export my history to CSV
  • Supersets, please 🙏