One of the things that I cannot stand about watching personal trainers in the gym is to see that they do not have a plan for their clients that is written out.  Chaos training is one of the worst things your personal trainer could be doing for you, this is basically not having a set training schedule for you that progress every 6 to 8 weeks.  Chaos training will get you some results in the beginning but it will not continue for you.  Plus how does your trainer know what weights and reps you did the last time you worked out with them if they are not writing anything down  from your workouts.  If you realize that your trainer is not following a plan for you, you need to ask them how they are planning your workouts based on your goals.  If they do not have a plan and cannot come up with one for you,  you need to fire them and find another personal training business that has a system in place that will progress you towards your goals.  I can recommend Fitness Together, they have a proprietary weight training program that will get you results.  You are paying good money to get you in shape and stay in shape, make sure you are getting what you paid for and some more.  Stay strong and good luck with your goals.