Periodization is the planned, sequential variation of training stimulus over time. Originally formalised by Soviet sports scientist Lev Matveyev, the idea is that fitness adaptations cannot all be peaked simultaneously, so the season is split into phases (macrocycles, mesocycles, microcycles) that emphasise different qualities at different times.
Classical "linear" periodization moves from high volume / low intensity to low volume / high intensity as competition approaches. "Block" periodization concentrates emphasis (e.g. three weeks of pure strength, then three of power); "undulating" periodization varies focus within the week. Modern practice often blends approaches.
Periodization works because adaptations have different time courses — aerobic base needs months, strength needs weeks, neural sharpness needs days. A periodized plan times each stimulus to land when the athlete can absorb it.
Where it's used
All long-term S&C and sport-conditioning planning, from high-school to Olympic and professional sport.
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