Coaching practices for Expanding Interval Testing

Describe almost anything you are working through and IX Coach finds the practices whose real-world fit is closest. For Expanding Interval Testing, these are the strongest matches in the current practice library.

Does this sound like the set of challenges you might be facing?

• When I’d swear I know roughly where a number lands, the real answer is constantly outside the range I’d have bet on
• I land on a number and just go with it, never pausing to ask what’s the most it could possibly be or the least
• I keep maxing out every few days just to see if I’ve gotten any stronger yet, and the numbers jump all over the place
• I need this to still be there a year from now, not just for the test on Friday
• I’ll grind on the same not-quite-working approach for months before adjusting anything, then change five things at once

Practices that may help

1. Practice confidence interval estimation
   Estimate ranges for factual quantities and check how often the true value falls within your range.
   Calibration Training
2. Sanity-check against known extremes
   Test your estimate against the clearly too-high and too-low bounds to calibrate your range.
   Fermi Estimation
3. Test maximum monthly, not weekly
   Test your true maximum once every 3-4 weeks — frequent testing disrupts the training pattern and creates false progress readings.
   Greasing the Groove, Made Practical
4. Space reviews at increasing intervals after each successful retrieval
   After each successful review, increase the interval before the next one — this is how you make memories last for years on the same total time investment.
   The Forgetting Curve: How Memory Decays and How to Fight It
5. Run experiments in rapid iteration sprints
   Cycle through short tests quickly to compress your learning rate.
   Tiny Experiments: Testing Change Without Committing to It
6. Use the broken-speech threshold for hard intervals
   When you can only get out single words, you are in the high-intensity zone — useful for timing interval work.
   The Talk Test: Gauge Exercise Intensity Without a Monitor
7. Audit which constraints are real and which are assumed
   List every constraint you’re working under, then test each one for whether it is actually fixed.
   Problem Reframing: Solving the Right Problem First
8. Run low-cost experiments on intersectional ideas
   Test cross-domain ideas quickly and cheaply before investing in them fully.
   The Medici Effect: Innovation at the Intersection
9. Uncertainty Tolerance Training
   Practice tolerating small uncertainties to build the capacity to sit with uncertainty without worrying.
   Worry Time: Containing Anxiety With Scheduled Worry
10. VO2 max intervals
    Use 4–8 minute high-intensity intervals at near-maximum effort to directly stress and expand your oxygen ceiling.
    VO2 Max and Longevity: The Peter Attia Framework

Describe your situation in your own words to search the complete practice library.