The reverse plank exercise isolates and strengthens the gluteus (butt) muscles and hamstrings. Done correctly, it engages both the abs and the lower back muscles. The reverse plank exercise can also be used as a rehab exercise to improve core and spinal stabilization.
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If you have received a video files, such as an AVI file, but cannot play it, it may be because you do not have the appropriate codecs installed on your computer. The video and audio tracks in a file have been  encoded  or coded, and in order to play the file back you need to decode it.n the left there is information on the container (like AVI), any metadata that might be read from the file and the Audio stream data. For now it is all blank so you need to open a file in it. The actual codec name for the video is the first detail under video on the right hand side of the program.