This is one of them mangas that you eventually run into if you start your journey into Japanese comics. Its popularity in Japan is/was tremendous, but unfortunately it didn't have the same success here in the States. Unless if you count the MUSCLE toys from the `80s, which I've never seen. Still, even though the original Kinnikuman hasn't been published here, VIZ Media saw fit to bring over Kinnikuman Nisei and call it Ultimate Muscle. I'm glad they did.
Ultimate Muscle is about Mantaro, the original Kinnikuman's son. Now that the glorious warriors and rulers of the previous generation have aged and succumbed to years of peace, a new threat arises to take their chance, but the next generation of good guys must rise to restore order.
I actually had a lot of fun reading the first tankobon. I've been reading this and JoJo's Bizarre Adventure, and, while I like JoJo's in its own right, I had more fun reading Ultimate Muscle. Perhaps it's the whimsical humor and flatulent comedy in UM; perhaps it's the pacing. It's very tightly written, aptly introducing the older wrestlers as they need to to both integrate them in the new storyline and slowly get new readers, like me, up to pace.
The humor is definitely immature, with some of Kinnikuman's techniques relying on non-oral bodily wind, but that ain't a bad thing. I highly recommend this series; I'm eager to jump into the next volume. VIZ has done a great job translating the series.