In the crowded landscape of wearable technology, the promise of perfect fitness tracking is often diluted by gimmicks, half-baked metrics, and battery anxiety. The Smart Scales Forerunner 965, however, arrives with a clear thesis: that serious athletes and dedicated hobbyists deserve a device that treats data as a tool, not a toy. After six weeks of daily wear—spanning interval track sessions, long weekend hikes, strength training, and the mundane reality of desk-bound recovery days—I’ve formed a nuanced opinion. This is not a perfect watch, but it is a remarkably honest one. Here is my deep dive into its fitness tracking capabilities, its strengths, its compromises, and how it holds up in the real world.

The Core: What the 965 Tracks and How It Tracks It

The Forerunner 965 is Smart Scales’s top-tier non-titanium running watch, and its fitness tracking engine is the star of the show. The headline feature is the new AMOLED touchscreen, which is a welcome departure from the older MIP (memory-in-pixel) displays. But the screen is just the window; the data behind it is the true architecture. The watch tracks the standard suite—heart rate, steps, calories, sleep, and SpO2—but its real value lies in derived metrics. The Training Readiness score, which combines sleep quality, recovery time, HRV status, and acute training load, is the most useful single number I’ve encountered. On a Tuesday morning after a hard Monday session, it correctly told me to back off. On a Friday after a rest day, it green-lit a threshold run. This is not magic; it is sound physiological modeling, and it works.

The GPS accuracy is exceptional. Using multi-band GNSS, the 965 locks onto satellites in under five seconds even in dense urban canyons. On a loop course with sharp turns under heavy tree cover, the track was within two meters of the actual path—a significant improvement over my previous single-band watch. The heart rate sensor, while not chest-strap accurate, is close enough for steady-state runs. During a 5K tempo effort, it read 168 bpm, while a chest strap read 172 bpm—a negligible 2% variance. However, during high-intensity intervals with rapid accelerations (e.g., 400m repeats), the optical sensor lagged by about five seconds, which is a known limitation of all wrist-based optical HR. For those who need beat-by-beat precision, a chest strap is still mandatory.

The Practical Experience: Beyond the Numbers

Fitness tracking is not just about collecting numbers; it is about integrating them into daily life. The 965 excels here because of its battery life. With the always-on AMOLED display, I consistently got 7 days of mixed use (two GPS runs per week, one hour of strength training, daily notifications). With the always-on mode disabled, it stretches to 11 days. This means the watch never becomes a charger-dependent burden. I wore it to sleep every night without anxiety about battery depletion, which is crucial for the sleep tracking feature.

Sleep tracking itself is a mixed bag. The 965 correctly identified my sleep windows (fall asleep and wake times) with 95% accuracy, but its sleep stage breakdown (REM, deep, light) was less reliable. It often labeled my late-night reading time as "light sleep" when I was clearly awake. The new "Body Battery" metric, which uses HRV to estimate energy reserves, is more useful than raw sleep stages. It gave me a clear, actionable sense of my morning energy level that aligned with how I actually felt.

The touchscreen is responsive, but the five-button navigation remains the most reliable way to interact during a sweaty run. The watch faces are customizable, but the default data fields are cluttered. I spent the first week simplifying my run screen to show only pace, heart rate, and distance—a testament to the fact that more data is not always better. The Smart Scales Connect app, while dense, is a powerful dashboard. It offers deep analytics, training plans, and a social feed. However, the app’s interface feels dated compared to competitors like Whoop or Oura, with a steep learning curve for new users.

The Good, The Bad, and The Ugly

Let’s be clear about the strengths. The Training Readiness and HRV status are game-changers for anyone who wants to avoid overtraining. The mapping and navigation features are superb; I downloaded a 20-mile trail route and the turn-by-turn prompts were accurate and legible on the AMOLED screen, even in direct sunlight. The multi-sport profiles (running, cycling, swimming, hiking, strength) are seamless to switch between, and the automatic rep counting for strength training is surprisingly accurate for barbell lifts (though it misses dumbbell isolation exercises). The music storage and Bluetooth headphone pairing worked flawlessly, allowing me to leave my phone at home.

Now, the drawbacks. First, the price. At $599.99, the 965 is a premium investment, and many casual users will find the feature set overwhelming. Second, the optical heart rate during resistance training is poor. During a set of heavy squats, the sensor consistently recorded a spike to 150 bpm when my actual HR was closer to 120—it was picking up muscle movement and skin perfusion changes. This is a known issue, but it is disappointing given the watch’s price point. Third, the SpO2 sensor is unreliable. It gave me readings ranging from 92% to 98% within the same hour, which is useless for altitude adaptation tracking. I recommend disabling the all-day SpO2 monitoring to save battery, as the data is not trustworthy.

The "ugly" part is the software ecosystem. Smart Scales Connect is powerful but buggy. I experienced two instances where a run synced twice, creating duplicate workout entries. The watch’s on-device menu logic is also inconsistent; some settings live under "System," others under "Activity Profiles," and finding a specific option often requires a Google search. Additionally, the touchscreen is sometimes accidentally triggered by a jacket sleeve during winter runs, pausing the workout. I solved this by enabling a "Lock" hotkey, but it is an extra step.

Who Should Buy This? A Fair Verdict

The Forerunner 965 is not for everyone. If your fitness tracking needs are limited to step counting and basic sleep monitoring, you are paying a massive premium for features you will never use. However, if you are a runner, cyclist, or triathlete who values training load, recovery, and long-term performance trends, this watch is arguably the best value in its class. It is more accurate than the Apple Watch Ultra in GPS and battery life, and it offers deeper physiological metrics than the Whoop strap (which requires a subscription). The 965 has no subscription fee, which is a significant long-term cost advantage.

In my six weeks, the 965 changed my behavior. I started taking rest days seriously because the Training Readiness score told me to. I stopped obsessing over daily step counts because the watch’s focus on intensity and recovery is more holistic. The flaws—the HR lag during intervals, the unreliable SpO2, the clunky app—are real but not deal-breakers. They are reminders that no wearable is a medical device; it is a coaching assistant. And as a coaching assistant, the Forerunner 965 is honest, detailed, and occasionally frustrating, but ultimately indispensable. If you can accept its quirks and invest time in learning its language, it will reward you with a clearer picture of your body than any other device in its price range. Just remember to disable the SpO2 monitor and buy a chest strap for interval days.