The oblique muscles are part of a group of muscles called “abdominal muscles”. You have four abdominal muscles, the most known is the rectus abdominis, the middle (washboard?) muscle and the whole group are often referred to as just “abs”. There’s the transverses abdominis, which lie along side the rectus abdomenis, and then the pair of muscles called the obliques. Obliques are located on each of the sides of your torso. External obliques are large, thin muscles on top and internal obliques are triangle shaped muscles just underneath the external obliques.