If one uses more than 90% of their one rep max (1rm) year round, their progress will stall. One way around this limitation is to use similar, but different exercises. Special exercises for the bench press include incline bench press, close grip bench press, floor press. Special exercises for the squat and deadlift include good mornings, box squats, front squats, and rack pulls.
The conjugate method is typically used in a conjugated periodization plan.