From the 4 point position (all fours), extend one leg to the side, placing the foot on the ground.
Start rocking your hips back and forth.
You should feel your adductors and hip joint being stretched.
Try to maintain a neutral spine
Руководство по Упражнению Adductor Stretch Dynamic Unilateral 4 Point Position - Тренировка Inner Thigh | MuscleWiki