Great Shape Ken 1983 (First Domestic Version) M#:  7318. 

There is also a second Domestic version Great Shape Ken Second Edition

There are a total of 6 versions of this doll.

England: Exercise Ken and Great Shape Gift Set (Barbie, Ken and Skipper)

Venezuela:  Deportivo Ken (Venezuela)

Canada:  Great Shape Ken/En Bonne Forme Ken (Canada)