縄跳びはこれが心配だ
https://3.bp.blogspot.com/-JFY5LYXZ_DQ/Vv-NvKPkCxI/AAAAAAAA5W4/uoSOGAWpDMIE__Q8HeGeQxYKsGxgekGww/s800/souon_rinjin.png