So, training is going well, you're progressing and you're enjoying yourself, but in reality the work you do in the gym or on the track is only half the picture, and that success will soon dry up if you don't take some time to seriously consider the other parts of the performance puzzle.
Your 'energy', or rather your ability to knock out a good performance either in training or competition, is really the combination of your fuelling and recovery; the outcome of everything you did to bounce back between training sessions. Think of it as the following cycle:
training > recovery > fuelling > training
There is a lot of overlap between recovery and fuelling, as 'recovery' is an umbrella term: It refers to all the biological processes that help your body to adapt and bounce back stronger and able to train and compete. So, what is involved?
This physical process of adaptation is called 'super compensation', and it is, in fact, the real reason you train. It is not whilst training that you become fitter and stronger, but actually between the sessions.
During rest, the body restructures your tissues at cellular level altering different features of your 'performance machine'. Such as improving the efficiency of the energy production apparatus of the cells, remodelling the connective tissue and adapting the neurological, muscular and cardiovascular systems so they are better able to handle the demands you place upon them.
In order to do this, you must give the body what it needs to carry out these processes: energy and raw materials.
These come from your diet.