(Warning: Extreme Blood and Gore!)
BF is using his Soul Form against GF, who's using her Demon Form. They both threw punches and kicks and used martial arts like Krav Maga, Taekwondo, and Muay Thai with killing intent while they trained in the Gravity Chamber that the scientist gave to BF. They used martial arts full-body workouts that allowed their bodies to grow stronger without imbalances.
BF throws a spin kick that damages GF's cheekbones, and GF responds with an uppercut that shatters BF's mandibles. Then, they both headbutt each other's foreheads, cracking their skulls and stumbling back while they have their healing factors repair the damage done to them. Once they recovered from each other's brain damage, they both charged.
They start throwing hooks, crosses, and jabs at each other, with their knuckles slicing their skin and tearing into their muscles. Because of GF's immunity to pain from being a Demon and BF only feeling pleasure from the damage he receives thanks to his Soul Form, they both don't stagger as they throw right hooks at each other's hearts, blasting holes into their torsos from the sheer strength of their punches.
Eventually, after three weeks of non-stopping training and adapting to insanely high gravity, they finally start feeling exhausted after acquiring the strength they needed for their perilous war against Hank and Tankman. After one hour of beating each other into a pulp, they finally collapse from the full exertion of their empowered bodies.
"Well, 1000x Earth's gravity will do, right, BF?" GF asked, breathing heavily from exhaustion.
"Yeah, that'll do us well." BF chuckled while breathing heavily.
Ayana and Dalia would spar against Tabi, who tests their stamina and endurance in long fights, while Whitty, Carol, and Sunday would use combat dummies to aim at a future enemy's vital points. Carol and Sunday don't usually do martial arts themselves, but they'd use them in case they only use their powers when necessary. Ayana and Dalia were improving little by little throughout the hours of training. Each minute passes, and their bodies become more accustomed to longer fights.
But eventually, the sheer exhaustion from sparring for hours on end stopped their progress, breathing heavily and sweating profusely.
"Alright, that was great, ladies. Get plenty of rest." Tabi hugged Ayana and Dalia with pride.
He kissed them both on the cheek, and Ayana and Dalia kissed him back. He checks to see Whitty, Carol, and Sunday practicing on the combat dummies.
"You've been training just as hard and long as my two wives. You should probably rest for a little while." Tabi told them.
"Didn't think you'd care about people's health, Tabi," Whitty replied calmly.
"I'm just ensuring we don't slack off or overwork ourselves. After all, this journey we're about to have will be massive." Tabi nodded his head.
"We know our limits, Tabi. Don't worry about us." Carol smiled at him before continuing to strike the dummy.
Tabi nodded his head in agreement with them before walking away.
AGOTI would train his body in the woods, using animalistic movements to increase his physicality. His strength, speed, stamina, endurance, and durability would improve massively because of the strenuous movements and the hours he's willing to go to push his body to extreme heights. He may not have the Soul Form like most of his allies, but his method of training his body would allow him to grow stronger than all other human beings.
Slicing through trees and boulders with his claws, AGOTI would grin like an unhinged jackal.
"I know most people don't like the way I fight..." AGOTI spoke in a growling and hissing voice.
"But the way I see my fighting style, this may be my key to victory with my allies..." AGOTI finished his quote as he raised his fist as if he's conquered a battlefield.