What a fourth session gives you
Each big lift can get its own heavy day (5/3/1) or be trained both heavy and for volume during the week (GZCLP). It's also the format of specialisation cycles such as Smolov.
Frequently asked questions
What's a good 4-day strength program?
GZCLP for a beginner, 5/3/1 for an intermediate. Smolov Jr or Smolov for a specialisation cycle on one lift.
Are four days better than three?
Not necessarily: the best number of sessions is the one you can sustain. Four days mainly add volume, useful past the beginner stage.