How running coaches wear a mechanical watch and a Garmin at the same time
Founder & CEO, Smartlet - CentraleSupelec engineer - Concours Lepine 2025, Awarded - CES 2026
Contents
- The two roles a running coach plays
- Why the Garmin Forerunner stays on the wrist
- Why the mechanical watch stays too
- How Smartlet holds both on one wrist
- A typical coaching day, hour by hour
- Which mechanical brands pair well with the Forerunner
- When to take Smartlet off
- Setting up your Smartlet
- Frequently asked questions
Key takeaways
| Point | What it means for a coach |
|---|---|
| Two watches, one wrist | A Garmin Forerunner for splits and pace, a mechanical watch for the rest of the day. |
| Lug width 20mm to 22mm | Most Garmin Forerunner models use a standard spring bar, fully compatible with Smartlet. |
| Single strap design | One Smartlet strap threads through the adapter and carries both watches at the same time. |
| No daily watch swap | Move from a track session to a sponsor meeting without changing watches. |
| Sport sessions | For high-impact running, keep your Garmin on its standard strap for that session. |
On the track, every split second matters. Off the track, so does looking like a professional. Running coaches live this contradiction every day, and most have already accepted it as a compromise: wear the Garmin, put the mechanical watch in a drawer. There is a better answer.
"A running coach is two professionals in one body. The athlete who measures, and the consultant who advises. Both deserve the right instrument on the wrist."
The two roles a running coach plays
A running coach is rarely just a coach. The morning is the track: warm-up drills with a junior 5K group, interval work with a marathon prospect, a tempo run with a recreational client who pays well and needs structure. The afternoon is different. Calls with athletes who cannot come in person. Programming the next training block. A meeting with a sponsor, a federation, or a parent of a junior runner who wants to understand why their child is doing 800m repeats at 90 percent.
The wrist tells the story. On the track, the wrist needs pace, heart rate, lap splits, recovery intervals, and the ability to record every session for review. In the office, the wrist needs to say something else: authority, stability, the kind of presence that makes a parent trust you with their child's running career.
For most coaches, this means swapping watches. The Garmin goes on for training, comes off for meetings. The mechanical watch waits in the gym bag, the office drawer, the dashboard of the car. It is a small inefficiency that becomes a large one over a career. You forget the watch at home. You arrive at a meeting with the Garmin still on, plastic strap and all, and feel slightly off. Or you arrive with the mechanical watch and realise you have no way to track the demo run you wanted to do with the client.
Why the Garmin Forerunner stays on the wrist
The Garmin Forerunner line is the reference for running coaches for a reason. Models like the Forerunner 265, 965, and 165 use a standard spring bar lug, which means they accept a regular strap. This is exactly what makes the Forerunner the right Garmin for dual wear: it follows the universal lug standard.
What the Forerunner gives a coach during a session is dense. Pace per kilometre in real time. Heart rate zones with vibration alerts when an athlete crosses a target threshold. Lap markers triggered automatically by GPS or manually by button press. Recovery time estimates after the session. Training Load and Training Status, which let you see across a two-week window whether an athlete is building fitness or accumulating fatigue. Race predictor estimates based on recent performance.
If you coach, you already use most of these. The issue is not the data. The issue is what the watch looks like when you stop running.
The Garmin Fenix line uses fat spring bars, which are thicker than the standard spring bars Smartlet is engineered for. The Forerunner line uses standard spring bars and is the right Garmin for the dual-wear setup. Confirm your specific Forerunner model uses a standard spring bar before ordering.
Why the mechanical watch stays too
A mechanical watch on a coach's wrist is not vanity. It is signal. When a parent considers paying you 800 euros a month to train their daughter for a national qualifying time, they are evaluating you the way they would evaluate any other professional. The watch is part of the evaluation, whether they notice it consciously or not.
Coaches who have built a career on the track tend to gravitate toward watches that match their world. A Tudor Black Bay reads as serious without being ostentatious. A Longines HydroConquest is solid, capable, and priced for someone who works for their money. An Omega Seamaster signals that you have arrived without shouting it. A Rolex, if your career has taken you there, says everything that needs to be said in a sponsor meeting before you open your mouth.
"The Garmin says I measure. The mechanical watch says I have been doing this long enough to know what is worth measuring."
Both messages matter. The Garmin is for athletes. The mechanical watch is for everyone else who decides whether your career grows or stagnates: parents, sponsors, federations, journalists, the runners who will pay you in five years what your current clients pay you today.
How Smartlet holds both on one wrist
Smartlet is a patented modular strap adapter, designed in Paris, awarded the Bronze Medal at Concours Lepine 2025 and selected for CES 2026. The system is simple in concept and precise in execution. A single strap threads through a central adapter. The adapter holds two watches, one on each side: your mechanical watch on one, your Garmin Forerunner on the other. Both function independently. Both are readable at a glance. Both on the same wrist.
The system is compatible with any metal watch using a standard lug width between 18mm and 24mm. The Garmin Forerunner 265 and 965 use a 22mm lug. The Forerunner 165 uses a 20mm lug. All three sit within the Smartlet compatibility range.
Three versions exist. The Smartlet One Classic in brushed SS316L stainless steel at 349 EUR. The Smartlet One Shadow in matte sandblasted PVD black SS316L at 449 EUR. The Smartlet One Titanium in Grade 2 titanium at 599 EUR. All three share the same dimensions and the same engineering. The differences are finish and weight.
Coaches spend hours on their feet, often demonstrating drills alongside athletes. The Titanium version is noticeably lighter than the Classic, which adds up across a six-hour coaching day. For coaches who are on their feet from the first warm-up to the last cooldown, the weight reduction is worth considering.
A typical coaching day, hour by hour
The advantage of dual wear is not theoretical. It is practical, measurable, hour by hour. Here is what a Tuesday looks like for a running coach in Paris, London, or Boulder.
| Time | Activity | What each watch does |
|---|---|---|
| 7:00 AM | Junior group warm-up | Garmin tracks lap times. Mechanical watch reads at a glance for group timing cues. |
| 8:30 AM | Marathon prospect intervals | Garmin records pace, heart rate, lap splits. You stay focused on the athlete. |
| 10:30 AM | Coffee meeting with sponsor | Position the Garmin toward the inside of the wrist. Mechanical watch faces the table. |
| 12:00 PM | Client call, programming review | Garmin shows the previous session's data while you talk through the next block. |
| 3:00 PM | Tempo run with paying client | Garmin guides pace zones. Vibration alert when heart rate climbs above threshold. |
| 6:30 PM | Dinner with federation contact | Both watches on the wrist. The mechanical watch leads the conversation, not the smartwatch. |
Nothing in this day requires you to take a watch off, put it in a bag, find it again, and start over. The mechanical watch is mechanical, it does not need charging. The Garmin Forerunner battery lasts a week of normal use, longer with the solar versions. The wrist becomes a continuous instrument.
Which mechanical brands pair well with the Forerunner
The pairing question matters more than the brand question. A coach is not collecting watches for display. The mechanical watch needs to be robust enough to live on a wrist that moves all day. It needs a case diameter that balances the Garmin visually. And it needs a standard spring bar lug that works with the Smartlet adapter.
The following brands fit naturally into a coaching context. All compatible with Smartlet via standard spring bar.
- Tudor. The Black Bay 41 and the Ranger are robust, mid-priced, and serious. Their lug widths pair cleanly with a 22mm Garmin Forerunner.
- Rolex. The Explorer at 36mm or 40mm pairs with a Forerunner 165 or 265 cleanly. The Submariner is the gold standard for a sponsor meeting.
- Omega. The Seamaster 300m is the most coach-friendly Omega, built for an active wrist.
- Longines. The HydroConquest at 41mm is a value-for-money option that holds its own next to a Garmin.
- TAG Heuer. The Aquaracer Professional 300 is built for active wrists.
- Seiko. The Seiko Prospex line offers entry-level robustness, and Grand Seiko sits at the upper end for coaches who have built a serious clientele.
If you already own a mechanical watch you love, the question is not which brand. It is which lug width. Anything between 18mm and 24mm fits Smartlet directly with the adapter included with your Smartlet. The full compatibility guide is here.
When to take Smartlet off
Honest answer: when you run alongside your athletes for sustained efforts. Dual wear is built for the wrist of someone who coaches, observes, demonstrates drills, and stops the watch every few minutes. It is not built for an athlete running an interval block at lactate threshold.
For high-impact running sessions where you yourself are training at intensity, keep your Garmin Forerunner on its standard strap for that session. Switch back to your Smartlet setup as soon as you finish. The strap change takes under two minutes with a spring bar tool.
For everything else (warm-ups, demonstrations, walking-pace work, recovery sessions with clients, drills, technique work, the entire teaching side of coaching) Smartlet stays on.
Setting up your Smartlet
The setup is the same for every Smartlet user, coach or not. Your mechanical watch on one side, your Garmin Forerunner on the other. Spring bars on each watch, threaded through the adapter, the single strap running through everything.
For a Forerunner with its stock silicone strap, the first change takes a little longer because Garmin's quick-release pins differ slightly from standard spring bars. The adapter included with your Smartlet handles this. After the first install, switching between the dual-wear configuration and a single-watch configuration takes minutes.
Once configured, the wrist looks like this: mechanical watch toward the back of the hand, Garmin toward the forearm. Or the reverse, depending on which watch you check more often during a coaching session. There is no wrong way, only the way that suits your wrist habits.
The Smartlet system lets a running coach carry both instruments through the full day, from the first warm-up to the last federation dinner, without ever choosing between the watch that measures and the watch that signals.
Frequently asked questions
Which Garmin Forerunner models are compatible with Smartlet?
The Forerunner 265, 965, and 165 all use standard spring bar lugs. The 265 and 965 use a 22mm lug width, the 165 uses 20mm, all within Smartlet's 18mm to 24mm range. The Garmin Fenix line uses fat spring bars, which are thicker than standard spring bars, and is not compatible with Smartlet. Confirm your specific model uses a standard spring bar before ordering.
Can I wear both watches for high-intensity interval training?
It is not recommended. Smartlet is designed for coaching contexts where you stop frequently to observe, give feedback, and reset. For sustained high-impact running where you are training at lactate threshold, use your Garmin on its standard strap for that session and switch back to Smartlet when you finish.
Do I need special tools to set up my Smartlet?
You need a standard spring bar tool to remove and install watch lugs, which is included. The adapter included with your Smartlet handles the Garmin quick-release pins. After the first install, switching configurations takes minutes.
Which Smartlet version should a coach choose?
The Classic at 349 EUR in brushed SS316L is the natural starting point and pairs with most mechanical watches. The Shadow at 449 EUR in black PVD suits darker or sportier watch cases. The Titanium at 599 EUR is the lightest option, which matters for coaches on their feet through a long day.
Can I wear Smartlet with watches other than a Garmin Forerunner?
Yes. Smartlet is compatible with any metal watch using a standard lug width between 18mm and 24mm. This includes mechanical watches from Tudor, Rolex, Omega, Longines, TAG Heuer, Seiko, and many others. Check the full compatibility guide for your specific model.
How long does it take to set up the dual-wear system?
Under two minutes per watch with a standard spring bar tool. There is no permanent modification to either watch. The Forerunner and the mechanical watch can both be returned to their standard straps at any point.
