Yes it is muscle strength . You have to use the muscles in your arms to hold your own body weight up . To me is is a very difficult task because your have to have a lot of strength in your arms and it helps you learn how to do your back hand spring.
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The major muscles of your back involved areas follows: serratus anterior, erector spinae,trapezius, latissimus dorsi and quadratus lumborum. Active muscles of your arms are triceps brachii and coracobrachialis. Key muscles of your abdomen are transversus abdominis, rectus abdominis and obliquus externus.