Back a few decades ago when it started to be the fashion in swing technique I used to practice in conjunction with my coach by adopting the hold a basketball between the knees and turn the top half of the body against the resistance of the lower half drill and commence the downswing by separating the knees and dropping the basketball drill, ie the drill Faldo etc etc advocated. I then, without the basketball obviously, took this technique onto the course.
My ball striking, control and accuracy, distance, shot trajectory, scoring, even the sound of the ball off the clubface, all improved dramatically. Wonderful I thought.
However, even though I was younger then and physically very fit, my body couldn't cope with the physical demands this type of swing technique placed on it, particularly the strain on my lower back, so I dropped this method despite the benefits it was having on my scoring.
Could I have continued with this method if I had studiously undertaken significant strength and conditioning and flexibility training both before attempting to change my swing technique and while doing so? Possibly, but being an amateur with time constraints and essentially playing for fun rather than to make a living and pay the mortgage, I didn't. I guess you can only do what your body will permit you to do and some folks are naturally more physically subtle and flexible than others.
Atb