cardiovascular fitness Archives

Why Your Heart Rate When Sleeping Reveals More Than You Think

May 12, 2025 · admin · When

The first time a sleep tracker alerted me to an erratic heart rate when sleeping, I assumed it was a glitch. The device logged a spike during REM—my pulse jumping from 45…

Why You Feel Dizzy When Exercising—and How to Fix It

May 1, 2024 · admin · When

The first time it happens, it’s jarring. You’re mid-sprint, mid-squat, or even just standing on a treadmill, and suddenly the room tilts. Your vision blurs. The world feels unsteady, and your body…