Prone Scaption Above 90 Degrees in External Rotation (The Prone Y)
The prone scaption in external rotation or shoulder Y exercise is part of an exercise series known as the prone T-Y-I-W series designed to provide dynamic stability, optimal muscle length and tension, and proper positioning of the scapula and shoulder girdle on the thorax during upper-extremity activities.
Ronai, P. (2016). Prone scaption above 90 degrees in external rotation (The Prone Y). ACSM'S Health & Fitness Journal, 20(4), 28-30. doi: 10.1249/FIT.0000000000000219