system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why did Jedi fighting styles become less acrobatic after the time period depicted in the Prequels?

In the prequels, Jedi fights involved a lot of flipping and jumping.  However, in the original trilogy, Jedi fights bore a much greater resemblance to traditional sword fights.  The fights involved a little bit of acrobatics, but were overall more subdued and realistic.   

In there an in-universe explanation for this?  Why did flipping and jumping go out of style?
gpt
In the prequels, the Jedi had proper training. Large schools/classes and much younger pupils. There was time for the students to learn and refine their skills.

By the time A New Hope comes around, the only Jedi left are Obi Wan and Yoda, who are in no shape to train Luke like they were able to in the prequels. They also don't have the time. Obi Wan only got a few days before passing, and Yoda's training was cut short by Luke's persistence to help his friends on Cloud City. In Return of the Jedi, Yoda can barely get out of his bed.

This is also notable during the final fight between Luke and Vader, where Luke let's his emotions get to him, causing him to strike at Vader with much more force and exertion.