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5 Reasons We Do 3-Minute Cardio Spike

We used to do all of our cardio at the end of a session — usually five to eight minutes of interval-style cardio designed to spike your heart rate after the strength training. 

This is a more traditional approach: strength training first, cardio last. Simple, familiar, effective. 

But over time, we realized something:
What if, instead of saving all that cardio for the end, we inserted shorter, higher-effort bursts throughout the session? 

Now, we implement two 3-minute cardio spikes in between supersets. This small change has had a major impact — leading to better energy, higher sustained heart rates, and smarter, more efficient workouts. 

Here are the 5 reasons we’ve stuck with it: 

  1. Eliminates Downtime
    While your coach sets up your next block of exercises, you’re not standing around — you’re moving. It transforms what used to be rest time into something productive and energizing.
  2. Keeps Your Heart Rate Elevated
    Instead of letting your heart rate drop between strength blocks, these intervals keep it elevated — resulting in a more metabolically demanding and effective workout overall.
  3. Allows for Higher Effort in Shorter Bursts
    Two focused 3-minute pushes let you train with more intensity than one long 6- to 8-minute session. More effort, less fatigue — and it fits naturally into the flow of your workout.
  4. Makes Progress Easy to Track
    These spikes create built-in checkpoints. For example, if you hit 15 calories on the bike in week one and 25–30 calories by the end of your program, your cardiovascular fitness has clearly improved.
  5. It’s Easier to Mentally Handle
    Let’s be honest — most people don’tlove cardio. But knocking out a few short rounds of it is a lot more mentally manageable than grinding through 6–8 minutes straight. It’sharder to hate something when it’s over in three minutes. 

Now to be clear: spiking your heart rate isn’t exclusive to cardio intervals. 

Strength training, when done in supersets or circuits with appropriately challenging movements, can elevate your heart rate just as much — sometimes more — than a treadmill or bike. 

Whether you’re doing a heavy goblet squat or knocking out a row sprint, the most important thing is this:
Push yourself appropriately. Venture outside your comfort zone — but not so far that you start to dread your training. 

Consistent effort over time always wins. 

— James Pratt 

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