A Three-Minute Armpit and Shoulder Stretch for Posture, Upper Arms, and Bust: Hinata Kato's Routine
ひなちゃんねる / Hinata Kato
In this short session from the channel Hina Channel, Hinata Kato demonstrates a three-minute stretch for the upper arms and the area around the armpits and shoulders. They present it as very effective for rounded shoulders, a hunched back, and increasing bust size. To make the effect visible, they work on one side of the body at a time so viewers can compare the stretched side against the unstretched side.
Step One: Armpit Rotations
The routine starts at the armpit. Kato instructs viewers to insert four fingers into the armpit and hold the muscles there with the thumb, then rotate the arm backward ten times while counting aloud.
Step Two: Loosening the Lats
Next, viewers grab the latissimus dorsi (the "lats") and circle the arm behind them ten times. Kato's explanation is that when this area loosens, the shoulder blades come together and slouching is "greatly improved."
Step Three: The Back of the Shoulder, and Why It Matters
The third movement stretches the back of the shoulder for 20 seconds. Kato spends the most time explaining this one. In their account, stiffness here leads to a chain of problems. The shoulders round forward, the trapezius tenses, the base of the neck bulges, and a hunched back develops. They add that when this happens the rib cage in the chest area sinks, which they say works against increasing bust size. That is why they urge viewers to stretch this area thoroughly.
Step Four: Side Stretch on All Fours
The final movement is done on all fours with the arms extended forward. Kato points to the middle of the armpit and says that if you feel that spot stretching, you are doing it correctly. They stress deep breathing throughout. They also say that stretching the upper body this thoroughly loosens the muscles and improves posture, and they claim it tightens and slims the face as well.
The Before-and-After Comparison
After finishing the first side, Kato holds both arms out to the camera to show a visible difference between the stretched side and the unstretched side. They react strongly, calling it shocking and amazing, and insist that "this is not a scam." Their interpretation is that the difference is evidence the muscles have relaxed and returned to their original position.
They then repeat the full sequence on the left side: ten armpit rotations, ten lat circles, 20 seconds on the back of the shoulder, and the all-fours side stretch. They keep reminding viewers to breathe deeply and get blood flowing. Kato says frequent stretching like this builds good muscle, makes the body less prone to stiffness, improves posture, and relieves shoulder stiffness. They particularly recommend it for women because, in their view, it also helps increase bust size. At the end they note that their arms now appear to be the same length.
Kato's Reasoning: Stiffness, Posture, and Blood Flow
In the wrap-up, Kato explains the idea behind the routine. Stiff muscles alone can change posture considerably and make blood vessels more prone to congestion. They see good blood flow as central to dieting, reducing upper-arm fat, building muscle, and increasing bust size, because blood is what carries nutrients to those areas. So they encourage viewers to keep blood circulating around the chest and shoulders.
Kato says they were also surprised when they first learned this from a "bone and muscle professional." According to that explanation, stiff muscles in this area pull the shoulders inward, which is why relaxing them and getting them back into shape matters.
An Anecdote About Posture and Presence
To illustrate how much posture affects appearance, Kato shares a recent experience. They walk or take the train to the hair salon, and while out for a touch-up the day before, two viewers recognized them. Kato reads a comment from one of them saying their back was so beautiful the viewer couldn't bring themselves to speak to them. Kato responds that they would actually love for viewers to come and talk to them.
From this, Kato concludes that simply moving and caring for the spine can create a noticeable aura. Good posture can change how your clothes look and also lengthens the neck. They end by encouraging viewers to try the stretch for themselves.
This is a 3-minute upper arm stretch. This is very effective for rounded shoulders, hunched backs, and breast enhancement.
Interestingly, this stretch is very effective. I'll do one at a time so you can compare.
First, insert four fingers into your armpits. Hold the muscles in your armpits with your thumbs and rotate your arms behind your back 10 times. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Next, grab your lats and circle your arms behind you 10 times. When this area is loosened, your shoulder blades will come together and your slouching will be greatly improved. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Next, stretch the back of your shoulders. Do this for 20 seconds. If this area becomes stiff, your shoulders will become rounded, your trapezius muscles will tense up, the base of your neck will bulge, and you will develop a hunched back, which is not good. If this happens, the rib cage in the chest area will sink, which is not good for increasing your bust size, so be sure to stretch this area thoroughly.
Next, get on all fours and stretch your arms out. Just be aware of this. If the area in the middle of the armpit that I'm touching is stretched, then this is good. Be aware that this area is stretching.
Make sure to breathe deeply while stretching. Stretching your upper body thoroughly like this will also help loosen your muscles and improve your posture. It also tightens and shrinks your face, so I highly recommend it.
You see this difference. Isn't this amazing? This is not a scam. I'll hold my arm out so you can see this. This is shocking. This is amazing. This is such a big difference. This is evidence that the muscles have relaxed and returned to their original position.
I also stretch the left side. Do 10 armpit stretches. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Next, stretch your latissimus dorsi muscles. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Next, stretch the back of your shoulders. Do this for 20 seconds. Please take a deep breath. Breathe and get the blood flowing through your body.
Finally, stretch your sides. To do this stretch, get on all fours and stretch the center of your armpits. Do this. Please take a deep breath.
If you stretch frequently like this, you will build great muscles and your body will be less likely to become stiff. This of course improves your posture and relieves shoulder stiffness. This is highly recommended for women as it is also effective in increasing bust size.
5, 4, 3, 2, 1. Good job! We did our best.
This is amazing. My arms are the same length. This is amazing. This is the end. I think you were surprised.
Just stiff muscles can greatly change your posture and make blood vessels more susceptible to congestion. Getting the blood flowing is very important for dieting, reducing fat in the upper arms, building muscle, and increasing bust size. It is the blood that carries nutrients here. So make sure to get plenty of blood flowing around your chest and shoulders.
This was surprising, wasn't it? I was also surprised when I learned this from a bone and muscle professional. When the muscles here become stiff, they are pulled inward like this. That's why it's so important to relax your muscles and get them back in shape.
I walk or take the train to go to the hair salon. Take a look at this comment. I had a touch-up at the salon yesterday. I was found by two viewers. "Your back is so beautiful I couldn't stop talking to you." You guys talk to me. I was told, "I couldn't talk to you." I really want to talk to you.
I realized that just by moving your spine you can create that much aura. Your fashion can really change with your spine. This is important because it also lengthens your neck. Try this.
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