Tekuk jari kelingking ke belakang sejauh mungkin. Tarik ibu jari ke bawah mendekati lengan. Luruskan lengan lalu tarik lengan bawah ke belakang. Tekuk lutut ke belakang. Condongkan tubuh ke depan lalu letakkan telapak tangan di lantai. Jumlahkan nilai yang diperoleh untuk menentukan tingkat kelenturan sendi.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Rest your palm and forearm on a flat surface, bending your elbow at a 90-degree angle. Reach over with your other hand and lift your pinky finger back towards your body. If it goes further than 90 degrees, you have hypermobile fingers in that hand. Repeat the test with your other hand. Give yourself 1 point for each pinky that you are able to lift back further than 90 degrees – up to 2 points total for this part of the test. Hold your arm out straight in front of you so that your palm is facing