I've been waiting ages for someone to post a copy of Gym Jam online (I never got it off TV) and it finally happened. Below is a clip from that cartoon with some great Johnny Gent animation. It also includes animation by Frank Endres and William Henning. This is one of the last good Famous Studio Popeye cartoons (with a few exceptions) before they got really bad. (I think all of us Popeye fans will agree that the downward slide to the end of the theatrical cartoons was not a good time for the animated sailor)
Following are frame grabs from some of Johnny's animation - strong poses with strong silhouettes that are essential for great cartoon animation.