A book I'm reading mentions "workbouts". I tried to look it up but Wikipedia and Wiktionary doesn't know the word and Google asks if I mean "workabout".
Is it really a word? Dialect, maybe? What does it mean?
Could you supply quote context?
It seems to me it would be a little more normal English if written as "work bout". I'm wondering if it's a technical term in the fitness industry, if so probably used there as a single word. I did find a proposal for an app to be called "workbout", for the purpose of encouraging people to share their workout experience with others. In several cases, workbout could have easily been a typo for workout. I suspect at least some of these are the same usage you found.
The word "bout" is itself a pretty unusual word, although I recognize it easily. An example that comes to mind is to have a bout of the flu -- an episode of the flu, a time of being sick with the flu.