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* '''High Intensity Interval Training'''. There are a number of studies that have shown that [[High Intensity Interval Training]] improves running economy.
=Measuring Running Economy=
In an ideal world, we'd be able to easily measure our [[Running Economy]] and see if things are improving. If we could measure our breath, find out how much O<sub>2</sub> we consumed and how much CO<sub>2</sub> we produce, we'd know how much energy we burned (and from fat or carbohydrate). Such testing would require controlling the time of day, day of the week, diet, and footwear for each test<ref name="Pereira-1997"/> as well as specialist equipment that is not available to recreational runners. Because this is not practical, the best measure we have of energy consumption is our [[Heart Rate]]. This is far from perfect, as [[Heart Rate]] [[Heart Rate DriveDrift| can vary for other reasons besides supplying O<sub>2</sub> for energy production]]. However, I believe it is a useful approximation and so I developed the simpler "Relative Running Economy."
=Relative Running Economy=
Given the difficulty of measuring Running Economy, I have developed a simple alternative that provides a relative value for Running Economy. This Relative Running Economy calculates a value based on how many heart beats are used for the distance covered. The formula that is shown below and there are more details at [[Relative Running Economy]].