Movement returns at the third position, but only under conditions. Legge's translation shows a subject urging his way forward with good horses, and finds advantage in recognising the difficulty of the course, in being firm and correct, and in exercising daily at charioteering and at methods of defence, after which advance in any direction becomes advantageous. This is the first line in the hexagram permitted to go anywhere, and the permission arrives attached to a training regime.
The position supports it. A strong stroke correctly placed in an odd position at the top of the lower trigram Qian, this line stands at the threshold of the restraining mountain above and answers to the topmost line, the one place in the figure where release finally comes. Its horses are good and its road is difficult, and the text treats both facts as equally real rather than letting either cancel the other.
What the daily practice supplies is the accumulation the hexagram is named for. Great Taming stores strength, and this line shows the storing in its most concrete form: not waiting, not hoarding, but rehearsing the specific skills the eventual advance will demand. The advantage promised at the end belongs to whoever has done that work, and the text is careful to make it conditional on exactly that.