This a reverse fly (shoulder abduction).
It trains the rear shoulder & scapula muscles.
These are very important in the golf swing. Especially on the lead arm.
It can be done with band resistance at home or on a cable machine in the gym.
4 Exercise Strength Workout For Golf
Staggered Stance Deadlift 🦵🏽🏌️♂️
Single Leg Hip Hinge