Best Fitness App for Athletes? How to Pick a Training Log That Lasts
The questions athletes ask before choosing a training log, answered plainly: what to track, what to skip, and how to avoid rebuilding your history later.
Athletes rarely go looking for a new fitness app when things are going well. They look when the current setup stops answering questions: why the last block stalled, whether volume crept up, or why Saturday's session felt terrible.
These are the questions athletes keep asking in Reddit threads and training forums when they choose a training log, with straight answers. TandemFit publishes this guide and makes one of the apps discussed, so we are clear about where it fits and where something else may suit you better.
"What should an athlete actually track?"
Track what you will review. For most athletes that means:
- Sessions you completed, not only the ones you planned
- Strength detail: exercise, sets, reps, load, and effort (RPE)
- Endurance detail: distance, duration, pace or speed, route, and laps
- Everyday context: steps, body measurements, and sleep if your devices provide them
- Fuel: meals and hydration around hard days
Anything you log but never look at is admin. Start with the sessions, and add food and body measurements once the habit sticks.
"Free app, spreadsheet, or paid app?"
A spreadsheet is flexible and yours forever, but it will not record a GPS route or time your rest. Free apps are a good start. Before you commit years of data anywhere, check one thing: can you export it? The best training log is the one you can leave without losing your history.
"How do I stop logging from taking longer than training?"
Use templates. Build your recurring sessions once, then log against them. Record cardio directly instead of typing it in afterwards, and let Apple Health or Health Connect bring in steps, distance, heart rate, and body measurements, so you are not entering the same number twice.
"I train at different gyms. Does that matter?"
It does if your program assumes equipment that is not there. An app that knows which equipment is available can help you pick a substitute before you get to the gym. TandemFit tags equipment on each strength record and lets you look up a gym before you travel.
"Does it matter which sport I do?"
The fundamentals are the same, but the balance changes:
| If you mainly… | Prioritise |
|---|---|
| Lift | Exercise library, fast set logging, personal records per exercise |
| Run or ride | GPS recording, laps and splits, imports from your watch or other apps |
| Do both | Strength and cardio in one history. See best app for hybrid athletes |
| Work with a coach | Sharing that shows the coach what you logged. See best app for coaching athletes |
"What about accountability?"
Logs are more honest when someone else sees them. That can be a coach, a training partner, or a group. In TandemFit you can pick a training partner for the week and answer each other's sessions, or join a group competition.
Where TandemFit fits
TandemFit is a training log for athletes who want strength, GPS cardio, nutrition, and progress in one history. It covers sets, reps, supersets, RPE, and rest timers; built-in GPS for runs, walks, and rides; meals by photo, barcode, or search; plus imports from Hevy, Strava, and Runkeeper and a full export whenever you want it.
It is not the right fit for everyone. TandemFit is available on iPhone and Apple Watch, with Android and Wear OS still in beta. If one discipline is all you do, a specialist app may be simpler. Our comparisons for strength, running, and nutrition cover those choices.
Takeaways
Pick the log you will still be using next year. Make sure it records what you will actually review, keeps logging faster than training, and lets you take your data with you.