M×K CREW, Riku made "Flex" available on August 16, 2021. Flex is considered explicit and may contain foul language. This song is about 3 minutes and 23 seconds, which is about the average length of a typical song. There is only one song in 願い, so we believe that "Flex" is a single. In terms of popularity, Flex is currently unknown. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.

Flex テンポ

The tempo marking of Flex by M×K CREW, Riku is Andante (at a walking pace), since this song has a tempo of 93 テンポ. With that information, we can conclude that the song has a slow tempo. This song can go great with yoga or pilates. The time signature for this track is 4/4.

Flex キー

This song is in the music key of B Minor. This also means that this song has a camelot key of 10A. So, the perfect camelot match for 10A would be either 10A or 9B. While, a low energy boost can consist of either 10B or 11A. For moderate energy boost, you would use 7A and a high energy boost can either be 12A or 5A. However, if you are looking for a low energy drop, finding a song with a camelot key of 9A would be a great choice. Where 1A would give you a moderate drop, and 8A or 3A would be a high energy drop. Lastly, 1B allows you to change the mood.