Amazfit’s latest wearable innovation is the Helio Strap. This slim health band bridges a traditional smartwatch and an HRM monitor. Unveiled in June 2025, this Amazfit Helio Strap HYROX Edition was “created specifically for the Elite 15” world-class athletes, signaling Amazfit’s focus on serious fitness users.
Unlike most smartwatches, the Helio Strap has no visible screen or buttons – it’s wrapped in a continuous elastic fabric with a high-res display tucked inside.
In effect, it operates as a wearable fitness tracker that “tracks health metrics like heart rate, stress, sleep, and energy levels 24 hours a day”, while remaining almost invisible on the wrist. This emphasis on biometric monitoring and recovery over flashy features has led observers to call it a Whoop-style device.
In short, the Helio Strap is a smart health band designed for athletes who want continuous data and recovery insights in a lightweight package (Amazfit promises up to 10 days of battery life, with no subscription fees in the Zepp app).
The BioCharge Tab: Real-Time Energy Monitoring
A standout feature of the Helio Strap is the new BioCharge system – an energy-tracking metric in the Zepp Health app.
BioCharge “tracks your body’s energy level across the day, showing how it dips during activity and recharges during sleep”. In practice, the app shows two sub-scores – Sleep Recharge and Daily Events – much like Garmin’s Body Battery.
As Ivan Jovin notes, the BioCharge visual layout “looks similar to how Garmin presents Body Battery,” with one curve draining through exercise and another building up during sleep.
This rolling energy score adds nuance beyond a simple daily readiness value: you might feel good in the morning but crash by midday, and BioCharge is designed to capture that ebb and flow.
Amazfit’s own blog describes BioCharge as showing “exactly how recovered or depleted your body is throughout the day”. It delivers “real-time insight into your energy levels, helping you decide when to train at intensity and when to focus on recovery”.
In other words, BioCharge turns the strap’s continuous measurements (heart rate, HRV-based stress score, sleep quality, etc.) into a fitness score that guides your workout plan.
A high BioCharge suggests you’re well-recovered and can push harder; a low score means it’s time to rest or do light activity. This offers athletes smart recovery insights to manage training load and avoid burnout, exactly the kind of feedback Amazfit highlights for its top-tier users.
How the BioCharge Score Integrates with Fitness Tracking
The Helio Strap feeds its data into the Zepp app, where BioCharge lives as its own tab. Early leaks show that Zepp’s menus replace the old “Readiness” section with BioCharge, hinting that this new score may supplant Zepp’s existing readiness metric.
Unlike a one-time daily rating, BioCharge is computed continuously from all-day biometric data. Amazfit even suggests the app will use BioCharge to recommend personalized training and recovery plans, similar to how Fitbit’s Daily Readiness or Whoop’s recovery alerts work.
In practice, the strap and app offer a suite of smart health metrics: 24/7 heart rate tracking, sleep analysis, stress monitoring, VO₂ max estimation, training load, and more. For example, the HYROX Edition includes modes like Race Mode and PFT Mode for high-intensity workouts.
All of this data is synced to the Zepp app (with no subscription required) which can also integrate with Strava, TrainingPeaks, and Adidas Running. In short, the Helio Strap’s score system (BioCharge) is tightly woven into Amazfit’s fitness ecosystem.
The strap does the biometric monitoring and the app converts those metrics into actionable scores and plans.
- Key Helio Strap Features:
- Continuous biometric tracking: 24/7 heart rate, stress, and sleep monitoring.
- BioCharge energy score: Combines Sleep Recharge and Daily Event metrics, akin to Garmin’s Body Battery.
- Advanced fitness insights: VO₂ max, training load, 27 sports modes (including HYROX Race and PFT modes).
- Integration and battery: Works with the Zepp app (no fees) and popular platforms (Strava, etc.); up to 10 days of battery life on a single charge.
Amazfit Helio Strap HYROX Edition vs WHOOP, Fitbit, and Garmin
The Helio Strap occupies a unique niche among wearables. It’s often compared to the WHOOP strap since both are minimalist fabric bands that prioritize 24/7 physiological tracking. Tech media already noted Helio as “a potential rival to the WHOOP 5.0”.
Like WHOOP, the Helio Strap has no visible screen and is meant to be worn nonstop. Unlike WHOOP, however, Amazfit’s device ties into the Zepp app (with no subscription fee) and can display a score on-demand.
Amazfit leaked content even suggests the Helio Strap is Zepp Health’s “answer to Whoop”– a subtle tracker focused on recovery, rather than a full smartwatch.
Garmin is also gearing up to launch its Garmin Index Sleep Monitor, expanding its lineup of health tracking devices. Unlike the Amazfit Helio Strap HYROX Edition, which focuses on the BioCharge energy score, Fitbit and Garmin typically offer watches or bands with screens and more extensive features.
For instance, many Fitbit trackers now include a Daily Readiness Score that analyzes sleep, activity, and heart rate variability (HRV) from the previous day to help users optimize their training and recovery.
That’s conceptually similar to Helio’s BioCharge – both aim to quantify recovery readiness. Garmin’s ecosystem includes the well-known Body Battery metric, which also blends sleep and activity into a single energy score. Amazfit explicitly notes the similarity: its BioCharge “appears similar to Garmin’s Body Battery score”.
Yet Helio’s strap form factor and athlete-centric design set it apart. It forgoes built-in GPS, music, and payments, focusing purely on fitness tracking and biometric monitoring.
Ultimately, the Helio Strap is best viewed as a specialized wearable fitness tracker. It trades off some features of traditional smartwatches (no visible UI, no apps) in exchange for a lighter, more discreet profile and emphasis on energy and recovery.
With up to 10 days of battery and deep integration in the Zepp app, it offers athletes a new way to see a “fitness score” (BioCharge) alongside their training data.
Combined with the T-Rex 3 smartwatch, Helio Ring, and the Zepp App, the Helio Strap forms a powerful 24/7 performance ecosystem. For HYROX World Championship contenders, it removes guesswork and delivers data-driven confidence in every stage of training.
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