Shave or not?

 So in the video, the course director put the tape on his hairy arm.

My personal experience, if you keep the tape for a long period on your skin, than depends on the tape; it can be challenging to remove. 

So for me, less hair or no hair was better under the tape.

Source: https://www.nmfootandankle.com/video/kt-tape-top-of-foot.cfm

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Google AI:

To maximize the effectiveness of kinesiology tape and prevent it from peeling off,It is strongly recommended to remove (shave) any body hair in the area where you will be applying the tape . 

The main benefits of removing body hair are as follows:

• Maintaining adhesive strength (preventing peeling): If there is hair, air gets trapped in the gaps, weakening the adhesive strength of the tape and causing it to peel off quickly.
• Reducing skin problems: If the tape gets tangled in the hair, it can cause severe pain or damage to the skin when removed.
• Maximizing effectiveness: The tape adheres directly to the skin, providing proper support to the muscles and skin. 

Points to note and countermeasures

• If you're applying it to areas with particularly thick hair (such as shins, thighs, or arms), it's best to remove the hair with a razor or shaver the day before.
• If the process is difficult, using an adhesive spray (underwrap) applied under the tape can reduce tangling with the hair and improve its hold.
• When removing the tape, you can reduce pain by doing so when your skin is wet, such as after a bath, and slowly peeling it off while holding down the skin. 

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Source: 

https://inner-fact.co.jp/

Tips from:

Da-mae

An INNER FACT employee born, raised, and currently residing in Hiroshima. During his student years, he competed in track and field, specializing in sprints. After becoming a working adult, he transitioned from marathon running to trail running. His favorite manga is "BLEACH." His favorite game is "Pokémon Stadium Gold & Silver." His dream is to complete the Barkley Marathons.

https://inner-fact.co.jp/7042/#:~:text=3%20%E3%83%86%E3%83%BC%E3%83%94%E3%83%B3%E3%82%B0%E3%82%92%E5%89%A5%E3%81%8C%E3%82%8C%E3%81%AB%E3%81%8F%E3%81%8F%E3%81%99%E3%82%8B%E3%82%B3%E3%83%84%20*%203.1%20%E3%83%BB%E8%B2%BC%E3%82%8B%E5%89%8D%E3%81%AB%E3%81%97%E3%81%A3%E3%81%8B%E3%82%8A%E4%B9%BE%E7%87%A5%E3%81%95%E3%81%9B%E3%81%9F%E7%8A%B6%E6%85%8B%E3%81%A7%E8%B2%BC%E3%82%8B%20*%203.2,%E3%83%BB%E3%83%89%E3%83%A9%E3%82%A4%E3%83%A4%E3%83%BC%E3%81%A7%E6%B8%A9%E3%82%81%E3%82%8B%20*%203.5%20%E3%83%BB%E3%82%A2%E3%83%B3%E3%82%AB%E3%83%BC%E3%82%92%E8%B2%BC%E3%82%8B%20*%203.6%20%E3%83%BB%E4%BD%93%E6%AF%9B%E3%81%AF%E5%87%A6%E7%90%86%E3%81%99%E3%82%8B%EF%BC%88%E8%B6%85%E9%87%8D%E8%A6%81%EF%BC%89

- Remove body hair (extremely important)

Areas with a lot of body hair are more prone to the tape peeling off, and removing it can be painful...
Shaving or otherwise preparing the area beforehand will help the tape adhere better.

Source: Da-mae

Source: Da-mae