Lateral Hip - Adductors

Be gentle with them!

Squat first.

The stronger your squats are the better your lateral splits are likely to be.

Level 1. Deep squats with widening stance, horse stance. Sumo deadlifts

Level 2. Pistol with leg abducted to support (like Cossack squat)

Level 3. Ultra-wide (Straddle) straight leg good mornings.

Level 4. Hand supported transitions front and rear

Level 5. Side bends, Straddle side bends, Chest to floor pancake

Pancake and adductor gains are relatively easy to make from here.