Many golfers struggle with an overactive trail arm. For most golfers, this causes low point control. For some golfers, this causes issues with trajectory or pull start lines. If you've worked on getting the trail arm to work correctly and haven't made as much progress as you'd like then I'd recommend looking at the lead arm. Pulling too much with the lead arm can trigger the trail arm throw, so learning how to use the lead arm can help retrain your trail arm release pattern.