Strength and conditioning coaching is much more than the exercises and the effort given in training. The outcome of a day's effort can be changed by additional activities, eating behavior, fluids, sleep, rest, stress, alcohol and more. Coaches understand that everything that is done affects the result of a workout and must be considered.
It is important for the trainer and trainee to be cognizant of - that it doesn’t matter how successful you are at this moment - it is where your habits are leading you. If you want to predict where you will end up follow the small gains and losses based on your daily choices. Bad habits will keep you back, good habits will push you forward.
A Great Read for Coaches and Athletes to Get Strong