Your hydration goal isn't 8 glasses. It's way more.
Intense daily training adds up to 1200ml to your water requirement. Thirsty Girls calculates your athlete-grade goal and makes sure you actually hit it.
Example goal · 140 lbs · Athlete
116 fl oz
14.5 cups · 3.4L per day
Generic hydration advice is designed for sedentary adults. If you train daily, you sweat out more than most people drink in a day. Precision matters: under-hydration tanks performance; over-hydration causes its own problems. A personalized, weight-and-intensity-based goal is the baseline every serious athlete needs.
Why hydration matters for athletes
Performance drops fast with dehydration
A 2% drop in body water causes measurable decreases in endurance, strength, and cognitive function. You feel it as fatigue, cramping, and slow reaction time.
Recovery depends on rehydration
Protein synthesis, glycogen replenishment, and muscle repair all require adequate hydration. What you drink after training matters as much as during.
Electrolyte balance starts with water
Getting base hydration right sets the foundation for any electrolyte strategy. You can't effectively supplement what a water deficit is already disrupting.
Injury prevention
Dehydrated tendons and cartilage are more injury-prone. Consistent hydration is a low-effort, high-return injury prevention strategy.
How Thirsty Girls helps
Features designed for your specific needs.
Athlete-tier daily goals
Your goal includes the +1200ml (≈41 oz) training bonus, calculated on top of your weight — giving you a target that reflects your actual needs, not average person advice.
Quick-log for training days
Log water in seconds during or between sets. The app's quick-add buttons mean you never lose your rhythm tracking intake mid-workout.
AI Coach mode
The Coach personality gives you straight-talking, performance-focused hydration guidance — no fluff, just what you need to hit your goal.
HealthKit integration
Sync with Apple Health to automatically factor in active calories burned. Your goal adjusts on high-intensity days so you're never under-drinking relative to output.
Common questions
How much water should an athlete drink per day?
It depends on body weight and training intensity. A 140 lb athlete with daily intense training needs roughly 115–120 fl oz per day as a baseline — Thirsty Girls calculates your specific number.
Should I drink water during workouts?
Yes. Aim for 6–8 oz every 15–20 minutes during moderate exercise, more for high-intensity or hot conditions. Use Thirsty Girls to track total daily intake and ensure you start workouts already hydrated.
Does HealthKit integration adjust my goal automatically?
Yes — when HealthKit data is available, the app adjusts your goal for active calories burned beyond a baseline threshold.
Get your athlete-grade hydration goal
Thirsty Girls is free to download. Your personalized goal is set up on day one.
Get Thirsty Girls — freeRelated
Runners
Runners lose 1–2 liters per hour. Thirsty Girls builds a daily goal around your training load — and actually reminds you to drink it.
Office Workers
Office workers are among the most chronically under-hydrated people on earth. Air conditioning, coffee, and zero movement cues mean your brain has stopped asking for water. Thirsty Girls asks for you.