Say hello, bonjour and hola to the latest batch of DS titles designed to offer self-improvement as well as entertainment. According to Ubisoft, the My Coach series "allows players to improve themselves and learn in an interactive and stimulating way, while having fun at the same time".
In short: they're a bit like Brain Training. Except My Word Coach is focused on improving your English language skills, while My French Coach and My Spanish Coach offer lessons in talking foreign. Or talking normally if you are French / Spanish.
Having given all three titles a try, I'd say Ubisoft's use of the term "fun" is a bit optimistic. Perhaps if they played My Word Coach some more, they'd understand words like "moderately entertaining" and "not as boring as books" are more appropriate.