Most training programs fail not because the work was wrong, but because the timing was. Knowing what to train is only half the equation. The other half is knowing when a quality needs to be refreshed before it starts to fade.
Based on the research of Vladimir Issurin and the principles taught inside the Performance Therapy Mentorship, this calculator takes the guesswork out of programming decisions. Enter the last time you trained each quality. The calculator tells you what’s still active, what’s fading, and what’s already expired, so every session has a purpose.
Whether you’re managing an athlete through a packed in-season schedule, navigating training around an injury, or building a return-to-sport progression, this tool gives you clarity when the calendar gets tight.