You don’t keep a training log.
Keeping a detailed log of your progress is one of the most important things you can do to make sure you are constantly progressing and acheiving optimal results from your training. Without this, your training is just guesswork. If you keep a log you can look back and set yourself a goal/PR to beat every session, or look back and make adjustments/changes when you hit a plateau. On top of this, how will you know you’ve improved over time? Wouldn’t you like to be able to look back and say ‘I’ve added 20kg to my Bench Press in the last 6 months!’ or ‘My 1 mile run time has dropped by over 30 seconds in the last 8 weeks’?
To build muscle you should always be striving to beat PR’s (personal records) in your training. Without your training log you will be hard pressed to remember all of your PR’s so you won’t know if your progressing or just spinning wheels, and without it, everything you do is just like driving without a map and your progress will be much slower than it could be.
This basic rule should form the basis of your entire workout plan, especially if strength is your goal. To structure your training approach, this is the most important factor. Nowadays everyone is so obsessed with all of the specific principles in the gym (such as rep ranges, grip variations, speed of reps, how many sets to perform, whioch days to train, exercise selection .. the list goes on ..) they fail to see the big picture.
Whatever your goal is, the underlying principle will always be progression.
Our bodies build muscle as an adaptive response to the environment they are exposed to. When you go to the gym, you break down your muscle fibers by lifting weights. Your body senses this as a potential threat to its survival and will react by rebuilding the damaged fibers larger and stronger in order to better enable them to cope with the threat next time. So in order to make continual gains in muscle size and strength, you must focus on progressing workout to workout in order to consistently increase that stress level and so growth.
Progression is in one of two forms – An increase in weight or an increase in reps. As long as you increase one of these every session you will give your body the incentive to grow stronger. If you ignore this and train without a logbook or a planned out session you will be ignoring the principle of growth and your gains will come to a grinding halt.
Your aim is to improve on a session by session basis, how can you do this without documenting it somehow? You need to record the lift, weight used and reps acheived so that the next time you enter the gym you can sit down, review the previous session/lifts performed and aim to smash the weight or reps you’ve recorded previously. Buy yourself a cheap diary and start writing it down!