[Request] Is this really part of the training?

Rin is helping her kouhai Arisu with her idol training, it was all going rather normally until she had a rather outlandish idea: Arisu has to keep singing even when she's tied up and tickled, supposedly a way to test her resilience and focus. Turns out Arisu is VERY ticklish and can't even start singing anything because even the slightest touch on her tummy already causes her to burst into laughter. Rin says she's not gonna stop until Arisu at least gets to the chorus, but the poor girl can't even get to the end of the first verse without laughing and completely losing her composure. One has to wonder if this is actually part of the training, or if Rin is just making shit up because she simply felt like tickling Arisu.