Blogs

Why Your Resting Heart Rate Is Suddenly Higher Than Usual

A resting heart rate that jumps five or six beats and stays there is usually explained by the week, not the heart. Here's how I work through the usual causes, why one high night matters far less than three, and where the line sits between tracking it and calling someone.

Mr.Apps · Jul 29, 2026

Best Apps That Explain Sudden HRV Changes in 2026

Why your HRV changed overnight, what it usually means, and the apps that actually help you figure out what to do next.

Anjali Singh · Jul 1, 2026

Why VO2 Max and Race Predictors on Wearables Often Argue With Reality

Your watch never measured your VO2 max, it guessed it from heart rate. Here's why that number drops in summer, why the race predictor lies, and how to read both.

Mr. Apps · Jun 24, 2026

Why heart rate alone doesn't explain strength training

Mr.Apps · Jun 23, 2026

What Does an HRV Spike or HRV Drop Actually Mean?

An HRV spike isn't always good and a drop isn't always bad. Here's why your HRV changed overnight, and when low HRV is stress, sickness, alcohol, or just noise.

Mr.Apps · Jun 17, 2026