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Kaley: We're here to talk about...
Beef: Health!
Kaley: Beauty!
Dieter: And a personal enrichment system known as Perfect You!
Beef: Get bouncy and smooth hair!
Kaley: Teeth that don't fall out! Dieter: Muscles that quiver like whippets!
All: That's right, you can have all of these and more when you sign up with... Best Fitness Friends!
~ The Best Fitness Friends introducing themselves to Roy and Wendy.

The Best Fitness Friends, later revealed to actually be named the Brute Force Federation, are the main antagonists of the Bowser Jr.'s Journey side mode from the 2019 3DS remake of Mario & Luigi: Bowser's Inside Story. They are a group of humanoid mercenaries who serve Fawful in his attempt to conquer the Mushroom Kingdom. Meeting the Koopa Troop under the guise of fitness gurus offering a cure for the Blorbs, they trick the Koopa Troop into leaving Bowser's Castle unguarded so that Fawful can seize the castle for himself. In actuality, they plan to betray Fawful and claim the Mushroom Kingdom for themselves. During the final battle, the three merge together to create a monstrosity that serves as the mode's final boss.



The Best Fitness Friends were founded sometime before they encountered Fawful. Who actually founded the group is unclear but it is implied that it was Dieter seeing as he is both the de-facto leader and the one who supplies Kaley with the pills that she takes.

Not long before the events of Bowser's Inside Story, either Fawful or Midbus approached them and offered them money in exchange for being his muscle to take over and occupy Bowser's Castle. They agreed but Fawful was unaware that they intended to betray him once it became convenient to them. It is implied that the only reason that they even joined Fawful was just to ensure that they didn't have to fight him in trying to conquer the Mushroom Kingdom until they had a power base.

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey

The Best Fitness Friends are first seen when Fawful summons them after witnessing Bowser leave his Castle for the Blorbs meeting. They were given the mission of invading and conquering Bowser's Castle for Fawful whilst he and Midbus dealt with Bowser, the former reminding them that he was paying them handsomely.

The trio enters Bowser's Castle announcing themselves as the Best Fitness Friends. Although they are almost kicked out by Roy, they fascinate him and the other Koopalings by showing their special cure for the Blorbs called Skeletone Formula:D, which they demonstrate by curing a Goomba of its Blorbs. They tell the Koopalings that they have no more and offer to make more if they gather the ingredients. Bowser Jr. boasts that he can find them and goes off with the Koopalings to find the ingredients.

This turns out to be a ploy for the Koopalings to leave Bowser's Castle unguarded, since only Lemmy was left to guard it with a skeleton crew of Minions, allowing Fawful to easily take over the castle with his Fawfulcopters and Mechawfuls. It is implied by Dieter, when meeting Kaley after she told Bowser of the attack, that the Best Fitness Friends served as his commanders and the leaders of the attack. During Bowser Jr.'s quest, the members of the Best Fitness Friends appear and encourage Bowser Jr. to keep going but they also manipulate the Koopalings into separating from Bowser Jr.'s party, either by making them turn against him or by causing a situation that forces them to split. These include supposedly dispatching Ludwig and ambushing Iggy at Cavi Cape and pushing him off a cliff.

Once Bowser Jr. collects all ingredients for the Skeletone:D and combines them with help from Broque Madame, Kaley steals his Skeletone:D by ramming into him. The BFF reveal their affiliation to Fawful and their true name to be the Brute Force Federation. They combine Jr.'s Skeletone:D with the poisonous breath of a Malodorius Fibbian to create Malatone Formula:X, which they use to brainwash Morton into throwing Bowser Jr. and Kamek into the sea. They also reveal their intentions to use more Malatone:X to brainwash Fawful's army so they can usurp Fawful for control of the Mushroom Kingdom. Sometime after this, they regrouped at Bowser's Castle and Kaley fired off a barrage of Malatone at the minion army, making them feral but obedient thugs that they sent into the kingdom to invade.

Washing on-shore at Plack Beach, Bowser Jr. realizes how selfish he was and recruits the Koopalings. Once Bowser Jr. and troop arrive at Bowser's Castle, Fawful had already left to steal Peach's Castle, leaving the Brute Force Federation to supervise. At first, the BFF manage to overwhelm Bowser Jr. and his forces, but Captain Goomba and the other captains fight off the BFF's minions, allowing Bowser Jr. to rescue Wendy and Roy, as well as feed Morton a Renewaleaf to cure him from the Malatone:X.

As the world darkens from the presence of the Dark Star, Bowser Jr. and his team fight through the BFF's henchmen and engage against them for a final battle. At first, Dieter attempts to allure Bowser Jr. and asks if he fights for good or evil, to which Junior replies that he fights for his own side since good and evil "are outdated, simplistic terms" and "everything is relative." This genuinely surprised Dieter but he didn't care and Jr. engaged him in battle. The BFF sent out their remaining minions before facing the team themselves, boosting their strength with Malatone:X. Following their defeat, the trio fuse together into a giant Malatone-infested monster that creates shadowy copies of the Koopalings. It also swallows more Malatone:X to increase its stats. After a lengthy battle, Bowser Jr. and his troops defeat the monster who explodes in a giant pink=purple energy ball which allows Jr. to reclaim the castle and Skeletone:D, bringing a permanent end to the Best Fitness Friends.



Dieter is the sunglasses-wearing leader of the group. He wears a black and yellow suit and has yellow hair.


Beef is a martial artist and the group's muscle. He has a blobish appearance with red hair, scarlet skin, and black pants with a red karate belt.


Kaley is a small girl with blue hair tied in a ponytail who can flap her wing-like hands in the air like a bird.



Dieter is a fitness-obsessed psychopath who showed some sadistic tendencies over keeping Wendy in a barrel. He is the smartest member of the trio and will do any means to achieve his goals. He is, however, a good leader who is a chauvinist, posing several times and getting into a brief pose-off with Ludwig about it.


Little is known about Beef's personality but he is the cliché strong silent type (a big reason as to why little is known about him) but is shown to somewhat care for his teammates.


Kaley is a conceited individual completely obsessed with being cute. She also happened to be a great manipulator, causing distrust in the Koopalings and indirectly convincing Wendy and Larry to leave Bowser Jr. However, deep down, she is a deeply psychotic and temperamental individual, a single comment being enough to completely enrage her (being called temperamental). She is also addicted to "those pills" which means that she is prone to addiction. She also has a soft spot for Beef, claiming that she feels lost without him.

Powers and abilities


  • Teleportation: All of the Best Fitness Friends can teleport in a burst of pink energy with pixilation in the middle.
  • Hand to Hand Combat: If the player is under-leveled and/or lacking in a tactical advantage (e.g. a ranged trooper against a flying enemy), the Best Fitness Friends can easily wipe the floor with them.
  • Expert Manipulators: The Best Fitness Friends were able to manipulate both Fawful, all six Koopalings, and Bowser Jr. relatively easily.






  • The Japanese names of Dieter, Beef, and Kaley (Sulimu, Muchio, and Kyutto) are alterations of "Slim", "Macho", and "Cute" respectively which reference their character types.
  • Beef is the only member of the BFF to appear in the main story, where he lies unconscious in the Bob-omb storage room where Ludwig stored him. He can only be seen when Fawful extracts Princess Peach from Bowser's body and after Bowser sheds his fat.
    • This addition was exclusive to the remake for obvious reasons.
  • The trio's physical colors represent their trooper type: Dieter is yellow (Ranged), Beef is red (Melee), and Kaley is blue (Flying).
  • Their team name "Brute Force Federation" was Beef's idea. Kaley instead wanted to call it "Cutie Coalition".
  • According to a Nintendo Direct interview, the Best Fitness Friends are from the same species as Midbus.


           TheMario.png Villains

Koopa Troop
Bowser | Baby Bowser | Bowser Jr. | Captain Goomba | Koopalings (Larry Koopa | Morton Koopa Jr. | Wendy O. Koopa | Iggy Koopa | Roy Koopa | Lemmy Koopa | Ludwig Von Koopa) | Kamek | King Boo | Boom Boom | Pom Pom | Reznor | Mega Goomba | Lakithunder | Mummipokey | Burt the Bashful | Salvo the Slime | Roger the Potted Ghost | Koopa Kids | Hoo | Blizzaurus | Army Hammer Bro | Elite Trio
Super Mario 64
King Bob-omb | Whomp King | Goomba King
Galaxy Armada
King Kaliente | Bugaboom | Peewee Piranha | Topmaniac | Bouldergeist | Dino Piranha | Major Burrows | Prince Pikante | Rollodillo | Glamdozer | Giga Lakitu | Petey Piranha | Gobblegut
Super Mario 3D World
Super Mario Odyssey
Mechawiggler | Broodals (Topper | Harriet | Spewart | Rango) | Madame Broode | Ruined Dragon | Cookatiel | Torkdrift
Goombas | Boos | Koopa Troopas | Chain Chomps | Hammer Bros. | Shy Guys | Magikoopas | Pokeys | Lakitus | Toadies | Bob-ombs | Piranha Plants | Bloopers | Wigglers
8 Bit Club
Wart | Mouser | Tryclyde | Fryguy | Clawgrip | Birdo | Shy Guys
Smithy Gang
Smithy | Exor | Mack | Bowyer | Yaridovich | Axem Rangers | Blade | Count Down | Domino
Beanbean Kingdom
Cackletta | Fawful | Dark Star | Midbus | Fawful Express | Fawful Mountain | Super Peach's Castle of Fury | Crawful | Snawful | Chain Chawful | Fawflant | Fawful Guy | Fawfulcopter | Fawflopper | Mawful Mole | Mechawful
Popple | Rookie | Beanies | Mechawful | Sharpea | Troopea | Beanerang Bro | Clumphs | Lakipea
Elder Princess Shroob | Princess Shroob | Sunnycide
Antasma | Belome | Best Fitness Friends | Big Guy the Stilted | Black Jewel | Booster | Bowser (USA) | Chuckolator | Count Cannoli | Croco | Culex | Dodo | Donkey Kong | Donkey Kong (Mario VS Donkey Kong) | Draggadon | Foreman Spike | Gooper Blooper | Grouchy Possessor | Harsh Possessor | Jojora | Kaptain Skurvy | Kent C. Koopa | King K. Rool | Kritters | Lucien | Mario | MegaBug | Mollusque-Lancuer | Nabbit | Overset Possessor | Peps | Phantamanta | Portrait Ghosts: (Neville | Chauncey | Bogmire | Biff Atlas | Boolossus | Sir Weston | Vincent Van Gore) | Rabbids: (Ziggies | Phantom of the Bwahpera | Rabbid Kong) | Punchinello | Ricky | Rudy the Clown | Sabasa | Shake King | Shrewd Possessor | Smorg | Squizzard | Tatanga | Three Little Pigheads | Tolstar | Tough Possessor | Tower Power Pokey | Valentina | Viruses | Waluigi | Wario | Watinga | Wingo | Yellow Belly/Helio

Koopa Troop
Paper Bowser | Paper Bowser Jr. | Paper Koopalings (Larry Koopa | Morton Koopa Jr. | Wendy O. Koopa | Iggy Koopa | Roy Koopa | Lemmy Koopa | Ludwig von Koopa) | Paper Kamek | Kammy Koopa | Paper Petey Piranha | Goomba King | Red & Blue Goomba | Koopa Bros | Tutankoopa | Tubba Blubba | General Guy | Lava Piranha | Huff N. Puff | Crystal King
Goombas | Boos | Koopa Troopas | Chain Chomps | Hammer Bros. | Shy Guys | Magikoopas | Bob-ombs | Piranha Plants
Secret Society of X-Nauts
Sir Grodus | Lord Crump | Shadow Sirens | Doopliss | Shadow Queen
Count Bleck's Minions
Count Bleck | Nastasia | O'Chunks | Mimi | Dimentio | Mr. L
Folded Soldiers
King Olly | Handaconda | Paper Macho Soldiers
Legion of Stationery
Colored Pencils | Rubber Band | Hole Punch | Tape | Scissors | Stapler
Jr. Troopa | Hooktail | Rawk Hawk | Grubba | Cortez | Gloomtail | King Croacus | Shadoo | Wracktail | Skellobits | Bonechill | Count Bleck's Father | Francis | Mizzter Blizzard | Lamp Scam Snifit


President Koopa | Lena | Iggy and Spike

Big Bad Wolf | Count Koopula | "Crime Wave" Clyde | King Koopa | Robot Princess | Wizardheimer
King Koopa (OVA) | King Koopa (Amada)

See Also
Donkey Kong Villains | Luigi's Mansion Villains | Wario Villains