Regular Show Season 4 Episode 8 One Pull Up ( Air Date 2012-11-26 ) Genre Animation, Comedy, Action & Adventure, Sci-Fi & Fantasy category. Overview "Rigby has never been known for his upper-body strength, so when the park employees have to go into the doctor and get their physicals, Rigby has trouble doing even one pull up, and so he must find a way to do so or get fired.".