A sarong or sarung is a large tube or length of fabric, often wrapped around the waist and worn by men and women throughout much of South Asia. The fabric most often has woven plaid or checkered patterns, or may be brightly colored by means of batik. Many modern sarongs have printed designs, often depicting animals or plants.
Although sarong is the clothing, but sarong can also be used as a weapon in combat to attack and defend yourself. Cindai is the generic term for the sarong style of silat used typically to lock in combat.
The video demonstrates training technique with repetition, and then at the end of the video shows a little bit of free-flow with some resistance. Though not shown in this video, the next progression of training would be sparring.