There are two aspects that are vital when you are wanting to evaluate your training:
- How much effort am I exerting?
- How much reward am I getting?
These are two sides of the same coin, and it can show how two radically different training styles using the same measurements can be equally valid depending on how you define the reward. At it's simplest view in this context:
Efficiency = reward / effort
Defining Reward
The most useful tool for deciding what a valuable reward is a clear, concise, measurable goal. Wanting to be "fit" is not measurable. I made this same mistake starting out. Because I didn't know what I want, I wasted my time, and the time of my personal trainer who tried to get me closer to his definition of "fit".
Even within the world of goals you have to prioritize some goals over others. For example, the work needed to improve your 50 yard dash times will be vastly different than the work needed to increase your endurance. If you want to run a marathon, endurance is going to have to be your primary goal. You can work on speed later, or be OK with the fact your speed as a marathoner won't ever be as fast as a sprinter. There's changes in the way your body has to use energy that are mutually exclusive with these two goals. Both marathoners and sprinters are extremely fit--but in very different ways.
If you have no goals, your efficiency is by definition: 0%
Defining How To Measure Your Goal
Each sport has a set of measurements that make sense in the confines of that sport. Running, swimming, weightlifting, etc. all have different metrics. Get used to those measurements and use them when you record your work. This is all about tracking your effort, and measuring how that effort is helping you progress toward your goals.
Express your goals (your reward) in terms of these measurements.
Evaluate Your Effort
Whenever you change your program (the way you organize your effort), see if you are progressing toward your goals more quickly.