后外跳，也称后外结环跳，即Loop jump，是花样滑冰业余比赛的六种常见跳跃中技术难度第三低的跳跃。在花样滑冰界，Loop jump常简写为Loop或字母Lo。

对逆时针旋转的运动员而言，后外跳，起跳时向后滑行，用右足后外刃起跳，左足刀齿不点冰，旋转360度后，用右足后外刃落冰，左足不接触冰面，并向后滑行。

对顺时针旋转的运动员而言，后外跳，起跳时向后滑行，用左足后外刃起跳，右足刀齿不点冰，旋转360度后，用左足后外刃落冰，右足不接触冰面，并向后滑行。

后外跳既可作为单跳，又可作为联合跳跃中的第一跳，或连续跳跃中的某个跳。另外，花样滑冰业余比赛的六种常见跳跃的落冰足恰好是后外跳的起跳足，因此后外跳也可作为联合跳跃中的第二跳（或第三跳）。

The Loop jump is a figure skating jump that takes off from a back outside edge and lands on the same backwards outside edge. For a jump with counterclockwise rotation, this is the right back outside edge. It is named from its similarity to the loop compulsory figure. The invention is widely credited to Werner Rittberger, and the jump is also known as the "Rittberger" in Europe. However, evidence exists that it may have been first done as early as the 1880s.