09/15/2026
The SAID principle stands for Specific Adaption to Imposed Demands. Generally, we apply this to movement selection - strength training to build strength, performing long bouts of cardio to build endurance, etc.
For athletic performance, we want to apply it more broadly. Exercise ORDER matters too. Traditional strength and conditioning philosophy would have you sprint early in a session to build speed, because it's neurologically demanding. Yet many sports teams sprint at the end of practice. Why? To practice producing power under fatigue. To make sure you have power in reserve for the 4th quarter.
Since the Boston HYROX is coming up, this means performing wallballs and running when your legs are fatigued, not just practicing them when you're fresh.
We can also apply SAID to environmental factors. Temperature, time of day, the food you've eaten that day - if it's new to you on race day, it can impact performance, for better or worse.
The point is, for solid athletic performance, consider these variables, and control what you can for consistency's sake.