Worried that their parents are hurting their health from not being active, the children encourage them to exercise.
Lincoln and Clyde are playing Muscle Fish in Lincoln's room. After beating a boss, Clyde says that he has to leave because his fathers are competing in the Royal Woods Ultra Extreme Ninja Competition. He explains that it's the ultimate obstacle course that tests a person's strength and athletics. Clyde says that Howard and Harold are doing this because they want to have a healthy life, so they can live long enough to see him grow up. After Clyde leaves by riding in a car being hauled by Howard and Harold, Lincoln discovers his mother and father sitting lazily on the couch. Lincoln tries to encourage them to go out for a walk, but they tell Lincoln that they're fine, and Charles comes by, wanting to go for a walk. The parents play "Nose Goes", and both of them win, forcing Lincoln to take Charles out.
At night, the siblings hold a house meeting, and Lincoln shows his sisters how inactive their parents are, which is further explained when Lisa shows them their urine samples, and fecal study (the latter of which is quickly rejected). Lincoln says that he has a plan to get them into shape so they can be healthy enough to see their kids grow up, to which all the sisters agree with.
The next day, Rita and Lynn Sr. deny the fact that they need exercise. However, they're proven wrong when Lynn Sr. can't put on his socks, Rita is unable to bend over to pick up the van keys, and say they can't walk up the stairs. At a park, Lynn suggests that they try rock climbing, but are unable to get a good grip. Lana suggests mud wrestling, and single-handedly takes down Rita, causing Lynn Sr. to hide in the van. Lincoln suggests that they tone down their methods. Lisa suggests tai chi, Leni suggests t-shirt folding (as a way to work on triceps), Lana and Lola suggest jump rope, Luna suggests guitar playing, and Lori suggests jogging, all of which Rita and Lynn Sr. can easily do (although, during Lori's jog, Lynn Sr. tries to chase an ice cream truck, but is tackled by Lana). Later on in the day, the parents thank their kids for introducing them to the joys of exercising and decide to go a run around the block. Because of them being active now, the siblings declare that their job is done.
In the middle of the night, Rita and Lynn Sr. wake all of their children up, because they were so excited with all the exercising, that they want to do more. They also said that because the kids cared about their health, they thought they'd also cared about their health in return. The parents make their kids go through exhausting exercises such as jumping jacks, push-ups, weightlifting, and jogs around the block (just like Lynn Sr. yesterday, they chase after an ice cream truck, but the parents stop them). After the exercising, Rita and Lynn Sr. present the kids with onion-infused water and (actual) grubs, all of which (except Lana) find disgusting.
A week later, the siblings are exhausted from all the exercising, and Lola initially blames Lincoln for making the parents' health crazy, with Luna agreeing. Luckily, Lincoln says he has a plan to make them stop. He has the sisters fake that the parents are making excellent progress such as tampering with the scale, discretely swapping their clothes with bigger sizes, adding big numbers to their weights, and turning the clock back. When the parents fall for these tricks, they surprise the kids with a spaghetti dinner. They say that because they've made such great progress, that they get an exercise-free day tomorrow, much to their joy.
The next morning, the siblings wake up, completely relaxed. However, their moment of relaxation is cut short when Lincoln discovers a note their parents left behind. Lincoln reads the letter and discovers that they're competing in the Royal Woods Ultra Extreme Ninja Competition. Fearing that they'll fail the competition, they quickly rush off to the arena.
The siblings arrive at the arena and discover their parents hanging precariously on a beam. After scaling the rock climbing wall, the siblings jump onto the beam their parents are on and ask why they're competing in the competition. The parents say that they believed that they were fit enough to join the competition, but the siblings tell them that they were staged. They only wanted to make them look like they lost weight so that they won't have to exercise with them. Despite this, the parents won't punish the kids, but the tender moment is cut short when the beam they're hanging from breaks due to all of their combined weight.
Later, the Louds are power walking with Lynn Sr. blowing his whistle and telling them to speed up. When Rita tells her husband that they need to tone down their activeness, they witness an ice cream truck passing by and begin to chase it down.
The title card depicts Lincoln running in an orange sweatshirt and sweatpants, which is the first time he is seen in one since "The Loudest Yard".
However, the outfit he wore in that episode was blue, instead of orange, and it didn't have a hood.
This episode seems to be a role reversal of the episode "The Loudest Yard", as in that episode, Rita wanted Lincoln to get some exercise, but in this episode, Lincoln wanted Rita, along with Lynn Sr., to get some exercise.
Luan, Lucy, and Lily were the only Louds who didn't help to get their parents to exercise, while Lola and Lily were the only ones not to be part of the plan of tricking them to think they made a great progress.
This is the second episode where the Loud family has spaghetti for dinner, with the first being "Brawl in the Family".
This is the twenty-sixth time Lincoln did not speak to the audience.
Episode 18 of Season 2 is the eighth episode where Lincoln did not speak to the viewers in either segment.
In the second last scene, the siblings were hanging onto each other:
Lynn and Lana were hanging on Luna.
Lisa was hanging on Leni and Lori.
Lincoln was hanging on Lori.
Lucy was hanging on Luan.
Lola was hanging on Lori and Lucy.
Lily was held by Leni.
Innuendo: When Lori and Leni witnessed their father's skinny jeans slip off, they quickly shielded their eyes in disgust, which implies that they caught a glimpse of his private areas.
Irony: The kids tried to encourage their parents into exercising, but they became fed up with exercising themselves.
Health Kicked - The title may be a reference to the phrase "health kick", which means to work out and eat healthier.
American Ninja Warrior - The Royal Woods Ultra Extreme Ninja Competition seems to be a nod to this sports show, which involves muscular people to traverse an obstacle course that tests their strength.
Chowder (TV series) - Lori and Leni switching their parents' clothes with bigger sizes is similar to how Chowder, Mung, and Shnitzel made the Catering Company bigger to trick Truffles into thinking she lost weight in the episode "The Flibber Flabber Diet".
Teen Titans - One of the boss levels in the Muscle Fish video game is named Mad Cod. This could be a reference to the recurring Teen Titans villain, Mad Mod.
Plot hole: Rita and Lynn Sr. are shown to be very lazy in this episode, despite having been shown to enjoy exercising in "The Loudest Yard" and "Suite and Sour" unless this takes place before those episodes.
Leni claims to not know what the word "fecal" means, despite her clearly leaving the pool along with the rest of her family when Lily has a fecal incident in "Linc or Swim" and one of the lifeguards even saying to the family as they leave that "fecal incidents are not fun."
Clyde says that his parents were training to sign up for "The Royal Woods Ultra Extreme Ninja Competition", but when its revealed that Rita and Lynn Sr. signed up for the same competition, the letter, by which they reveal their registration, refers to it as "The Royal Woods Ultimate Extreme Ninja Competition".
Even though the Royal Woods Arena was supposed to be hosting The Royal Woods Ultra Extreme Ninja Competition, the marquee outside of the building reads "Ultimate Extreme Samurai Competition" instead.
When Howard and Harold passed by the Loud House, the horn of the car they're hauling can be heard. However, no one is in the car, so it's unknown who honked the horn.
Given Lola's position when she popped out of her room after being woken up by her exercise crazed parents, she appears to be sleeping on Lana's side of the room.
When Rita went to weigh herself on the scale, not knowing Lisa tampered with it, she had her shoes on. But normally when one weigh themselves they take off their shoes because the extra weight of the shoes increased the weight of the scale.
The family chasing after an ice cream truck.
The siblings teaching their ways of exercising to their parents.
The parents becoming health crazy.
The siblings dreading the constant exercising.
Rita's tankini being mentioned.
Lincoln coming up with plans that end up working, but also backfire.