It's so funny that Palpatine is also a skilled lightsaber duelist and fighter, enough to take on 4 Jedi masters / war veterans at once and easily kill 3 of them (everyone except Mace Windu almost immediately gets wasted), and then to go on to beat Yoda too later. Like, it's funny to think about the logistics of it all. Who exactly has Palpatine been practicing with here? How often has he been hitting the gym in the past 15 or so years?
Up until that point in "Revenge of the Sith", it looks like Palpatine's main skill is manipulation. He doesn't really look like he's sunk a lot of points into melee combat. Supposedly, he trained Darth Maul, but Maul got wrecked by Obi-Wan Kenobi as a padawan and has been "dead" for over a decade by the time Palpatine is confronted by the Jedi and suddenly opens a can of whoop ass. Dooku is a skilled duelist, sure, but Dooku has been running the other side of the war, so he's not sneaking into Coruscant on a regular basis to be Palpatine's evil gym buddy.
Also, when is Palpatine finding the TIME to train that fiercely? He has a desk job! He has TWO desk jobs! He's the Supreme Chancellor of the Republic and also secretly running both sides of the war, all to slowly build up his Galactic Empire. His schedule must be packed. His time management skills are the real legendary dark powers here. He has to regularly be going straight from meetings with Republic Senators and the Jedi Council into video calls with General Grievous and the Trade Federation. Where on his calendar is this man putting his evil workouts where he waves around a red lightsaber?
I really don't like the idea that Palpatine is just so formidable in the Force that he doesn't ever have to worry about spaceships falling from orbit or keeping in shape. He's definitely not a normal guy, but he is also just a guy, given that Darth Vader eventually throws him off a Death Star bridge to kill him (temporarily, if we're going by the sequel trilogy, which I... don't). I understand that at this point in time, Palpatine is possibly super-boosted by the Dark Side thanks to the sheer weight of misery he's inflicted on the galaxy thanks to the war, so he's feeling GREAT, strong and fast and ready to rumble, but I don't think pure power in the Force alone should necessarily translate to staying flexible despite your desk job and having refined sword skills?
So, I guess I have to assume that Palpatine has a collection of personal dueling droids somewhere that regularly get wrecked by a lightsaber or something? Is there a gym maintenance droid somewhere rebuilding these other droids and chugging happily along learning every week (it gets its memory wiped on a daily basis) that the Supreme Chancellor secretly likes to play with lightsabers like a Jedi LARPer? Not an uncommon hobby! There are fan conventions for that!
The book "The Rise of Darth Vader" might actually answer the question how tf Palpatine have the time to do all this.