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The third edition of the book includes numerous changes.
* The table of race performance to [[VDOT]] has not changed at all, but there is now a table for those with slower performances. This covers VDOT values of 20 to 30, mile race times of 9:10 to 12:55 and marathon times of 4:57 to 6:44.
* The Easy pace is now a range of paces roughly centered on the second edition's single Easy pace. The range is 76 seconds/mile wide for VDOT of 30 down to 42 seconds for a VDOT of 85. The second edition used about 74% of [[VO2max|V̇O<sub>2</sub>max]], and the third edition uses 70% to 79%.
* Paces for T, I, and R have not changed, nor obviously has the M pace.
* There is now the idea of '''H'''ard running which is based on subjective feel rather than a specified pace.