Each phase of the training calendar may be further subdivided to make the program more manageable. Mesocycles last from several weeks to several months, depending on your goal. Mesocycles are then divided into smaller microcycles, which last about one week to four weeks and focuse on daily and weekly training sessions. Use a spreadsheet program to plan your intensities and volumes throughout each phase of training, improving your ability to analyze and change your workout, according to a 1999 article by Lee Brown and Richard Knee, published by the National Strength and Conditioning Association.