Heart Rate Tells You When. Glucose Tells You Why.

The Limitations of Traditional Fitness Wearables

For years, fitness professionals and athletes have relied on heart rate monitors, calorie trackers, and GPS wearables. These tools measure effort, duration, and intensity, but they have one major limitation: they only tell you when something happens, not why.

It's frustrating not knowing the 'why' behind certain workout moments. When your heart rate spikes mid-workout, is it because you’re properly pushing your limits… or because your body is running out of fuel? This uncertainty can hinder your coaching effectiveness.

When a client is exhausted after a session, is it just due to training intensity… is there a deeper metabolic issue at play?

Traditional wearables can’t answer these questions. However, continuous glucose monitoring (CGM) can be used.

CGM vs. Heart Rate Monitors: The Missing Link

Heart rate monitors show how hard your body is working.

CGMs show how your body is responding to the work.

Here’s why that matters:

• Heart rate = external measurement (effort, intensity, stress)

• Glucose data = internal measurement (energy availability, metabolic resilience, recovery)

When you pair glucose data with heart rate data, you get a complete picture of what’s happening during training and why performance may suffer or thrive.

The Depth of Glucose Data: Fitness Insights You Can’t Get Anywhere Else

• Energy Availability in Real Time

  • CGM data shows if a client is starting a workout fueled or running on empty.

  • You can spot glucose crashes mid-session before they cause performance dips.

• Recovery and Stress Indicators

  • Elevated glucose overnight may indicate poor recovery or stress overload.

  • This allows coaches to adapt programming and avoid burnout.

• Nutrition Impact

  • CGM reveals how pre- and post-workout meals affect energy, performance, and fat loss.

  • No more guessing which snacks are sabotaging progress.

Why Glucose Data Changes Everything for Coaches

Imagine this scenario:

• Two clients do the exact same workout.

• Their heart rates are nearly identical, but one feels energized while the other crashes.

Without CGM data, you might assume the issue was training tolerance. With glucose data, you can see that one client’s blood sugar dropped dramatically mid-workout, which explains their fatigue.

Uncovering the why behind performance fluctuations, recovery struggles, and plateaus is a relief. This level of insight empowers you to make more informed coaching decisions.

How to Start Using CGM in Your Coaching

You don’t need to abandon your heart rate monitor; it’s still a valuable tool. But pairing it with CGM takes your coaching to the next level.

• Identify trends

  • Combine heart rate zones with glucose stability to fine-tune programming.

• Personalize nutrition

  • Use glucose insights to guide pre- and post-workout fueling.

• Prevent overtraining

  • Spot early signs of stress and poor recovery.

Join the BioFit Trainer Society

Want to learn how to integrate CGM with your existing fitness tools for deeper client insights?

Join the BioFit Trainer Society

As a member, you’ll get:

• Monthly live training on CGM coaching strategies

• Access to case studies and data breakdowns

• Peer support and Q&A with other forward-thinking coaches

The BioFit Trainer Society is your shortcut to mastering the future of fitness coaching, a future where CGM has the potential to revolutionize the way we understand and optimize training.

Heart rate tells you when. Glucose tells you why.

You leave crucial insights on the table if you only use heart rate monitors and calorie trackers.

Don’t just measure effort, understand the body’s internal response.

Join the BioFit Trainer Society today and start coaching with precision.