1. Introduction
At the gym, logging happens between two sets: thirty seconds, sweaty hands, your mind already on the next rep. The paper notebook holds up but says nothing about progress. The spreadsheet says everything, provided you sit down in front of it. Muskle is a work in progress aimed at that empty space: a training tracker where saving a set takes less attention than racking the bar.
How might we make logging a workout as fast as a note taken between two sets, so progress becomes readable without effort?
2. Problem definition
Existing fitness apps mostly target discovery: programs, videos, exercise catalogs. They poorly serve the person who already knows what to do and simply wants a reliable record of what they did. The result is intermittent usage: a few sessions logged, then back to the notebook.
Logging must cost less than forgetting
As long as recording a set takes more than three interactions, the paper notebook stays faster. That is where the work starts.
Progress only shows up after weeks
A tracker offers no immediate reward. The trend has to be visible from the very first sessions, otherwise perceived value stays at zero.
A workout repeats a lot
The same exercise, the same loads, give or take. That repetition is material to work with: pre-fill instead of asking.
3. Designing the solution
The project is still being explored. Current directions focus on the workout as a living object — automatic recall of the last performance, thumb-friendly input, history available without leaving the exercise — and on reading progress, where the challenge is choosing what to show rather than showing everything.
Prototype the logging flow and test it in real conditions, at the gym, with the constraints that come with it: one hand busy, little time, no appetite for thinking about the interface. This page will be updated as the experiment progresses.