A log book is essential if you are serious about monitoring your progress. A logbook does not have to be a book, it is simply a place where you record on a per session basis what exercise you have done, how much you have lifted, how many sets you have done, your diet etc. You can put as many details as you like, even how you felt at that time, or as little details as you wish, perhaps just the date, the exercise and the maximum weight you lifted for this exercise.
What is important in a logbook is to have regular and reliable data so that you can observe the trend in your progress. Are you lifting more weight or is your workout reaching a plateau? Continue reading