How did she do it? One theory is that the best way to improve economy is simply to run a lot (which Radcliffe certainly did during those years). Jones was coauthor on another study a few years ago that measured running economy in beginning runners before and after a 10-week training program. With no specific instruction and no exercise other than running, economy improved by about eight percent, and the improvements were correlated with subtle changes in running stride (e.g. a less extended knee at toe-off). With practice, your body automatically seeks the most efficient way to move.