The next health metric you’ll track: sweat

For years, hydration advice has been built on general rules: drink more water, add electrolytes if you’re training hard, and bring a bigger bottle when it’s hot. But if you’re an athlete, a biohacker, a coach, or just someone who takes performance seriously — you’ve probably hit the limits of one-size-fits-all guidance.

Now a small but growing wave of brands is treating sweat as the next measurable signal in everyday wellness.

Electrokare recently opened its public beta, giving early users a first look at how sweat data fits into real training conditions. Its sensor reads electrolyte loss straight from the skin, offering insight into how much sodium and potassium you lose during a workout. No blood tests, no waiting for symptoms, and no guessing whether your hydration plan is working.

FLOWBIO began testing its own sweat-tracking sensor with endurance athletes last year, adding another signal that sweat is becoming a measurable part of training.

From general guidance to personal signals

Personalized hydration is already moving into the mainstream. Electrolyte brands like LMNT  and Hydrant normalized the idea that hydration needs more than water, which is a step forward. But even with better products, most people are following package solutions, not their body’s actual needs.

Sweat data meets the moment when broad guidelines aren’t enough. Continuous glucose monitors showed consumers how their body processes food, rings like Oura tracked sleep quality and recovery, and wearables have turned heart rate variability, resting heart rate, and body temperature into daily metrics.

The pattern is clear: data beats guidelines when the guidelines don’t match your physiology.

For people already tracking glucose, sleep, and recovery, hydration is the next logical data layer. As sweat sensors become more accessible, they’re pulling hydration into the same personalized, metrics-driven mindset that’s already reshaped how people eat, sleep, and train.