Diagonal

She felt a sharp pain in her diagonal abdominal muscle while doing sit-ups.

The yoga instructor demonstrated a pose that targeted the diagonal muscles in the abdomen.

The mathematician used diagonal lines to demonstrate the relationship between the variables in her graph.

The mathematician explained how to find the length of the diagonal of a square.

The teacher drew a diagonal line on the chalkboard to divide the equation.

The teacher explained how to find the diagonal of a square by using the Pythagorean theorem.

The Pilates instructor focused on engaging the diagonal abdominal muscles to improve core stability.