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A new study from UT Dallas just unveiled a sensor that tracks the battle between Cortisol (stress) and Melatonin (sleep) in real-time. If you feel "tired but wired" at night, you need to understand how these two hormones interact—and how to fix the imbalance before your head hits the pillow.

The ACSM has named Wearable Tech the top fitness trend of 2026. Discover how to use your device's data to master "Zone Zero" training and prioritize sustainable recovery over high-intensity burnout.