Sentence:  ... your Foales by scoping & galloping thereon, shall be brought to such nimblenesse, strength, and true <WSD>footemanship</WSD>, that they shall not only haue a most excellent braue trotte, but also during theyr lyues ... they shalbe frée from that foule vice of stumbling. 
Meaning of the word marked with <WSD> tags:  The skill or ability to run ("of humans or animals").