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 racing car sped across the track, leaving behind a trail of diagonal tire marks.

The physical therapist recommended exercises to strengthen the diagonal muscles in the patient's back.

The dancer showcased her impressive flexibility by performing a diagonal split.

The chessboard is arranged in alternating light and dark diagonal squares.