To find the ratio of miles run to calories burned, we can set up the ratio as follows:
\[ \text{Ratio} = \frac{\text{Miles run}}{\text{Calories burned}} = \frac{5 \text{ miles}}{1010 \text{ calories}} \]
To simplify this ratio, we can divide both the numerator and the denominator by 5:
\[ \frac{5 \div 5}{1010 \div 5} = \frac{1}{202} \]
Thus, the ratio of miles run to calories burned is:
\[ \boxed{\frac{1}{202}} \]