Your Program Lasts Eight Weeks

Adaptation is a slow biological process. The neural changes that drive early strength gains take three to four weeks to take hold. The muscular changes take longer. The technical refinements that let you express strength on heavier loads take longer still. Switching programs every two weeks resets the clock before you have seen what the program can produce.

A reasonable program length is eight to twelve weeks. During that block, change one variable at a time, volume, intensity, exercise selection, and keep everything else stable. At the end of the block, evaluate honestly. Did the lifts you targeted go up? If yes, the program worked, and you can extend it or run a similar one. If no, you have learned something specific about what to change.

The alternative, constant novelty, feels exciting but produces dilettantes. Progress belongs to the people who run boring programs for boring durations, then evaluate the result with a calm head.