Build pressure now'; two strokes pass then 'Rate up now'.At rates below 25 it's easy to hit the rate just using increased pressure - it is harder at rates from 26 and above to get the rate - you have to be more deliberate building the pressure then the rate.Start a change like that at the correct place in the stroke cycle. Make these changes at the catch. The pressure change starts at the catch; stroke rate changes begin at the catch. To do this effectively, athletes must know they are making a change half a stroke cycle in advance of the change. Call the change at the FINISH. This gives them advance warning of the change.There are changes which happen at the finish like stepping down in stroke rate or a rhythm call and these must be called at the catch.Be half a stroke ahead of time if you give the calls. Listen to when the cox or the caller made the call to change.Your goal for the workout is to execute more and more successfully.