If you like to hit certain records all the time in the gym, or in sporting events, then don’t expect to hit them higher all the time without peaking for them, and giving yourself a day’s complete rest (at least) before attempting them.
This is also why most if not all the members of the gym who play sport never train on a Friday, or do very light sessions before a game on a Saturday. This is all about delivering your very best performance on a Saturday and game time.
Since the variety of exercise you now do in the gym will be vast, the overall effect to start with will be to make you more tired than normal because it will be the culmination of many different efforts over demanding exercises.
This is just your body getting used to different movements that require a different amount of energy levels.
Also, the training we do over a week requires three different energy systems due to the different lengths of time we spend doing different exercises, as well as the differing intensity levels we like to use too.
Research has shown time after time though, that if you are prepared to put the effort in doing well thought out exercises to suit your needs and performance levels, then with the amount of rest factored in too, then you will be able to smash through your previous personal bests!
All of this shows there is methodology used in your training, rather than just a “hit and hope” mentality that never works for anyone longer term, and increases the chance of injury greatly.
You need to make sure you plan is right, hitting all the right areas, and making sure your performance gets constantly better!
