Home / Old School / 18 – Abdominal Stretch – OS Sold out! 18 – Abdominal Stretch – OS SKU: OS-18-01 Category: Old School Related products Sold out! Old School 06 – Armbar – OS Sold out! Old School 02 – Lock Up – OS Sold out! Old School 03 – Clutch Onto Opponent – OS Sold out! Old School 04 – Irish Whip – OS