What Is Cardio Load (and Target Load) in Google Health?

Cardio Load is a heart-rate strain score, not a step count. Your Target Load is a personalised weekly range built from your own recent activity history. If you've opened Google Health and felt baffled by a number that seems impossibly high or weirdly inconsistent, you're not alone. The feature has some of the most frustrated threads in Google's community forums, and for good reason: the app barely explains it.

This post breaks down what Cardio Load measures, how Target Load is calculated, and why the goal can feel out of reach even when you work out regularly.

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What does Cardio Load measure in Google Health?

Cardio Load is not a step count, a calorie burn figure, or a measure of Active Zone Minutes. It's a cardiovascular strain score based on continuous heart-rate data. It measures how hard your heart worked and for how long.

The underlying model is called TRIMP (Training Impulse), developed by exercise scientist Eric Banister in the 1970s.^[1] It scores each minute of exercise by how hard your heart was working. The harder you pushed, the more points you earn. A casual walk earns very little. A tempo run earns a lot. Both time and intensity matter.

Cardio Load only works with a Pixel Watch or Fitbit worn during activity, because it needs continuous heart-rate tracking.^[2] Your phone alone won't generate it. If you don't wear your watch during a workout, that session doesn't count, even if you log it manually.

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How is Target Load calculated, and why is mine so high?

Target Load is an adaptive weekly range calculated from your own previous four weeks of data. It's not a fixed number Google invented. It reflects what you've actually been doing and adjusts week by week as your fitness changes.

The calculation uses something called the acute-to-chronic workload ratio (ACWR). It compares this week's effort to your four-week average. Sports coaches use the same approach to avoid overtraining and injury.^[3] The target sits around a ratio of 1.0, meaning this week should roughly match your recent average. Go much higher and you're overtraining. Go much lower and the app flags you as under-doing it.

If your Target Load feels impossibly high, there are usually two reasons. First, you may have had a very active four weeks, so the baseline is high. Second, if you only wear your watch some days, the app may catch your busy days but miss your rest days, which pulls the average up. One forum member described their target as "ridiculously high even though I work out every day." That's what happens when your four-week average is high but this week is falling short.^[4]

There is a seven-day waiting period before you see your first Cardio Load score.^[2] The app needs at least a week of data to set your baseline.

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Why did Google switch from daily to weekly targets?

Google switched Cardio Load from a daily to a weekly target in October 2025, after extensive backlash from users who found daily targets demoralising and confusing.^[5]

The original daily model penalised rest days. If you took a recovery day, the app flagged you as undertraining. Then if you pushed hard to catch up, it flagged you as overtraining. The whiplash was constant. The core problem: cardio fitness is built over weeks, not days. Rest days are part of the plan.

The weekly model fixed this. Exercise science has always used the week as the basic unit of training, not the day. You can now have hard days and easy days in the same week without the app flagging every quiet day as a problem. That said, users who moved from 10,000-step daily goals still find Cardio Load jarring, partly because the number looks abstract compared to steps.

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What's free and what requires Google Health Premium?

The Cardio Load score itself and the basic adaptive weekly Target Load range are free features, available to anyone with a compatible Pixel Watch or Fitbit device.

The AI-coached version is behind the paywall. Google Health Premium launched on May 19, 2026, alongside the rebrand. It costs $9.99 a month or $99.99 a year (up from $79.99), and is included with Google AI Pro and Ultra plans.^[6] Premium members get a Gemini-powered coach that reads your Cardio Load and sets goals inside a Recovery, Maintain, or Build framework.^[7]

On the free tier you see the adaptive range but not the coaching that tells you what to do with it. That's probably why so many users feel lost: the number is right there, but its meaning is hidden behind a paywall.

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The Google Health rebrand and what changed

If you recently opened your Fitbit app and found it had become something entirely different, here's what happened. Google rebranded Fitbit to "Google Health" on May 19, 2026. The full rollout completed around May 26, 2026.^[8] Accounts, data, and subscriptions transferred automatically. You cannot roll back to the old app.

The transition cut a lot of what made Fitbit feel social and fun. Challenges and Adventures had already gone in March 2023. The 2026 redesign then removed:^[9]

• Badges
• Groups
• Community feed
• Direct messaging
• Custom profiles
• Sleep Profile
• The web dashboard

The backlash was big: review-bombing, community threads with 1,500+ upvotes, and enough anger that Google published a damage-control roadmap on May 27, 2026.^[10]

You can only export data from removed features until July 15, 2026. After that, Google deletes it.^[11] If you want to keep your badge history, community posts, or group data, export it before that date.

On the hardware and data side:

• Google Health works with Health Connect on Android and Apple HealthKit on iOS.
• Garmin devices can share data to Health Connect from June 2026.
• Your existing Fitbit or Pixel Watch hardware still works.

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Does the adaptive weekly goal model actually work?

The short answer is yes, the underlying science is solid, even if the implementation has rough edges.

Using an adaptive weekly target rather than a fixed number is backed by research. One clinical trial tested an adaptive goal system against a fixed 10,000-step target over ten weeks. The adaptive group's daily steps fell by just 390, while the fixed-goal group fell by 1,350. That's 960 more steps a day in favour of the personalised approach.^[12] The closer a goal is to what you can do right now, the more likely you are to hit it. The perimenopause fitness app post at /blog/best-fitness-app-perimenopause/ goes deeper on this, since fixed versus adaptive goals is a recurring theme in fitness app design.

The ACWR approach is well-supported in sports medicine for managing injury risk. It's the same logic behind Garmin's Training Load and Training Status features.^[3] Where Google has struggled is the user experience. The in-app explanation is thin, the useful coaching is behind a paywall, and the shift from Fitbit's social format to a clinical training metric has left many users cold.

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How Motion approaches the same problem differently

Google's Cardio Load is built on the same core idea as Motion: a personalised, adaptive weekly goal based on your own recent history, not a fixed number. The model is right. The two apps just execute it differently.

The practical differences are worth knowing if you're looking for an alternative.

Cardio Load requires a heart-rate monitor worn during every workout. Motion's effort-based goal system works from any source: your phone's step counter, your existing Fitbit, a Garmin, or an Apple Watch. You don't need new hardware. Motion connects to your existing tracker and reads from there.

Cardio Load is useful for athletes tracking training intensity. But it's less useful for most people who just want to stay active. A beginner's 30-minute walk generates very little Cardio Load, not because it isn't valuable, but because the metric was built for people already working at moderate to high intensity. Motion's adaptive AI goals count all movement. That same 30-minute walk counts in full.

The social layer Google removed is available in Motion through weekly activity battles. Battles are scored on effort relative to your personal goal, not raw numbers. A friend who does 4,000 steps can beat someone who does 12,000 if they hit a higher share of their own target. Research backs this up: one clinical trial found the competitive group logged 920 more daily steps over 24 weeks than the control group.^[13] That's the feature Fitbit users lost in the rebrand.

Google's AI coaching layer costs $9.99 a month. Motion's adaptive goal doesn't need that extra layer. The goal itself is easy to understand, and it's part of the free product.

If Cardio Load has felt confusing, or if you miss the social features Fitbit used to have, Motion works with your existing Fitbit or Google Health data and gives you a goal that's easy to follow. See also Motion vs Fitbit alternatives for a direct comparison.

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The bottom line on Cardio Load

Cardio Load is a real training metric built on solid exercise science. The adaptive weekly Target Load is the right approach: personalised, not generic. But it requires an HR watch, it's hard to read without the Premium coaching layer, and Google removed the social features that made Fitbit worth using for most people.

If you're sticking with Cardio Load, a few things help:

• Wait seven days for your first score.
• Wear your watch every day so the baseline is accurate.
• Don't panic about overtraining warnings on rest days.
• Decide whether the $9.99/month Premium tier is worth it for you.

If you'd rather have a weekly goal that adapts to your history and works from any tracker, Motion was built for that. The social accountability and step challenges that used to be Fitbit's strongest feature are part of it too.

Try Motion free →