Race day conditions are often unpredictable and intimidating—even for athletes who have prioritized and trained diligently. While environmental factors are often times the most frustrating, stemming from the fact that there's no control over them, it doesn't mean that you have to be less prepared when race day comes around.
Logging workouts across a variety of environments is essential to understanding how your body responds under different conditions such as heat, humidity, altitude, and many others.
The Race Day Calculator within Nix Solo combines your historical Nix workout data with 10 years of environmental data from your given race’s date and location. The calculator then delivers personalized, science-backed hydration guidance for the specific conditions you're expected to be racing in. Instead of relying on one-size-fits-all guidelines, it learns from your own training history—factoring in how your body has reacted in similar conditions—to predict exactly how many fluids and electrolytes you should be consuming each hour.
To use the Race Day Calculator in the Nix Solo app, navigate to the Home Screen and scroll through the Calculators modal:
There are two ways to find the Race Day Calculator within the Nix Solo app.
Option 1: From the Home Screen find the Calculators module. Swipe until you see the link for Race Day Calculator.
Option 2: Navigate to Settings > Calculators > Race Day Calculator
Figure 1A - Home Screen (All Calculators)
Figure 1B - Home Screen (Race Day Calculator)
Figure 1C - Settings > Calculators
Figure 1D - Race Day Calculator
Begin filling in the details of your upcoming race: race type (running, cycling, or other), date, and location.
Note: for the location input, enter full city name or zip code, and then hit search. Select the correct location within the listed results. In the example below, the athlete has an upcoming race in San Diego, CA.
Figure 2A - Entry Fields
Figure 2B - Search for San Diego
Figure 2C - San Diego Search Result
Once all of the inputs are completed, the app will reference the conditions from the past ten years of weather data and calculate your recommended hydration strategy based on your historical Nix workout data. Please be patient during this process.
Figure 3A - All Inputs, Calculating
Review the results from the calculator. For the San Diego example, the Nix Index is expected to be a 67.
Based on this athlete's historical workout data, she should expect to lose 27.5 oz/hr of fluids and 2,289 mg/hr of electrolytes during her upcoming race.
Note: this calculator can be used for outdoor workouts only. Additionally, a user must have at least one workout logged above and one workout logged below the predicted Nix Index for the upcoming race in order to utilize this calculator.
Figure 4A - Race Day Result - Expected Nix Index
Figure 4B - Race Day Result - Expected Fluid and Electrolyte Losses
Share or save the Race Day Calculator results via email, text, or within your camera roll. This allows you to refer back to these stats as you prepare for race day.
Figure 5A - Race Day Shareable Graphic