You can’t judge every book by its cover. But we’re going to in the case of the following 10 exercise guides. Judging by their covers, these are some weird workout books.

workout books

You can never overtrain at relaxercise.


workout book

Adults Only. This unfortunately titled 1980 book is from the guys who brought us the book Pumping Iron. George Butler also co-directed the movie Pumping Iron.


workout books
catflexing

How to do PAWsitive reps with PURRfect form.


workout books

Here it is: the most ’80s book ever.


workout book

Jack Garbarino: inventor of the home workout.


workout books
sexual fitness book

Let’s get physical.


workout book

Do you take the blue steroid pill or the red steroid pill?


workout books

This is advanced relaxercise.


workout books
marvel exercise book

With exercises like “The Fantastic One-Two-Three-Four” and Spiderman’s “Way-out Wall Climbs,” this 1976 paperback was purposely weird, and we approve.


workout books

“I promise, lady, it’s a bioenergetic exercise.”


See also: Bad Muscle Magazine Covers, Vol. 4 and Joe Weider Sex & Dating Manuals