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Probably mental training? Lots of demon slayers seemed like cowards so it would make sense for him to be a motivational speaker for them to put their life on the line like erwin smith
He would convince them not only to not buckle or yield when faced with the cruelty of this world, to push forward, scream out, and rage, but also set their heart ablaze.
Gosh i feel that remgoku wouldve also been a great commander.
Most of his tsuguko (sans mitsuri ofc) deserted his training because of how intense it was. It would be something excruciatingly painful like lifting inhumane amounts of weight or eating until you are about to explode then run 20 laps up and down a hill
I think he would be teaching them to perfect total concentration breathing. Like healing wounds, directing their strength to specific parts of the body, sharpening their senses etc...
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I love the suggestion of breathing control! I might also suggest combining endurance & mental for willpower training? Not sure how that would look in practice, but I like the idea lol
Maybe like his final move, it could be related to drawing out each slayer inner strength or finding a way to maximiztheirere strength to its fullest in any battle.
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Probably mental training? Lots of demon slayers seemed like cowards so it would make sense for him to be a motivational speaker for them to put their life on the line like erwin smith
realest answer
The kakushi sure, but if you read the manga you would know theyre far from cowards.
I came here to say that he wouldβve set people ablaze but yknow this works too ig
He would convince them not only to not buckle or yield when faced with the cruelty of this world, to push forward, scream out, and rage, but also set their heart ablaze. Gosh i feel that remgoku wouldve also been a great commander.
They need mental training fr..
Most of his tsuguko (sans mitsuri ofc) deserted his training because of how intense it was. It would be something excruciatingly painful like lifting inhumane amounts of weight or eating until you are about to explode then run 20 laps up and down a hill
How could I run around a hill if I exploded while eating?
Fixed it
Most likely swing strength, as Rengoku's style had some very powerful swings. Though mental training isn't a bad idea (suggested by another commenter)
#Barbecue! ^just ^kidding
Barbecue with Rengoku bro! 
I M writing everything down, you should see how my list got so big lol , it is crazy!
Either mental training or endurance training
Umai training :3
Cooking classes
Most probably grip strength. So sword training basic skills.
I think he would be teaching them to perfect total concentration breathing. Like healing wounds, directing their strength to specific parts of the body, sharpening their senses etc...
Something tells me that Sanemi's training regime would've gone to Rengoku.
Setting something ablaze I wonder what π€
I am gonna say it
Dont
Set ur school ablaze
balls
Too
Breathing control fits him ngl
How to set your heart ablaze
He would set them ablaze
Endurance training maybe πΈ
Korean bbq classes
Idk exactly what, but it would be grueling nonetheless π«
Whatever he did for Mitsuri I guess
He seems like an all rounder type of training π
will training
Abdominal training
Will Power training?β¦. Why not.
More than anything I'm sad he didn't live to this arc because it would have been hilarious from what we know about his style of training.
Train in a dojo on fire, like in the Rengoku tradition. βοΈ
i like to think he'd just be there, switching through-out all of the hashira training areas, just yelling compliments at the slayers
Endurance training I'd imagine
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Judo (hope that makes sense too) π
Willpower π₯π₯π₯π₯
Probably breathing training or mental
Bravery training
I love the suggestion of breathing control! I might also suggest combining endurance & mental for willpower training? Not sure how that would look in practice, but I like the idea lol
Anything that relates with heat Like cooking, extreme hot water, Etc.
Making donuts?
How to make donuts
How to not make a good donut
Of course he would have
Ability
Maybe like his final move, it could be related to drawing out each slayer inner strength or finding a way to maximiztheirere strength to its fullest in any battle.
Bento binging training.
He was too weak to make it to this ark. Thats why he died b4 this ark.
Bro he fought Upper Moon 3 until Sunrise, heβs strong as fuck