A Three-Minute Upper Arm Routine, and Why Hinata Kato Says Daily Strength Training Matters

The routine is presented as a follow-along sequence, and the spoken cues are brief. It begins with the arms held close to the sides and then extended out to the sides. Throughout this part, the cue is to draw the shoulder blades together, with a "thumbs up" position added at one point.

Next, the elbows are bent to 90 degrees and raised as if knocking on a door. A one-arm movement follows, in which you hold your elbow and bend the arm. Kato notes at this point that they can't fully demonstrate the movement on camera. The same movement is then repeated on the other arm. The routine ends with a push-up variation done with the arms facing toward the body, followed by a cue to lift the hips.

Kato describes the routine as one that "uses a lot of arm muscles" in just three minutes.

After the workout, Kato explains the reasoning behind it. They stress that getting blood flowing to the upper arms is very important. In their view, better circulation in this area matters both for slimming the upper arms and for increasing bust size.

They also argue that strength training is essential if you want slimmer upper arms. Without it, they say, the upper arm muscles gradually weaken and the arms become loose. Kato links muscle to metabolism: the more muscle you have, the better your metabolism, your body temperature rises, and fat is burned more easily. These are Kato's explanations as stated in the video.

They support this with their own experience. They once lost weight without training their upper arms, and later lost weight while doing upper arm training. According to Kato, the results were "quite different," and that experience is what convinced them of how important muscle training is.

Kato then shifts the emphasis away from weight loss. They point out that three minutes is a tiny part of a 24-hour day, and that strength training makes them feel much better. They say the purpose is not simply to lose weight. It is to raise self-efficacy and self-esteem.

The mechanism they describe is keeping promises to yourself. Kato says that by doing this, they learned to take care of themselves. They stress that the promise can be small and doesn't need to involve any big accomplishment. Two or three minutes of training every day is enough. According to Kato, this habit raises both self-efficacy and self-esteem, and that alone makes life more enjoyable.

Kato says they are glad they adopted this habit, which is why they are sharing it. They close by encouraging viewers to do the routine even if it's only for three minutes, because the training feels good, and invite them to do it together.