Here’s my take on how to practice if we have no time to get to the range or course. It only takes about 5-10 minutes a day!
Most adult golfers unfortunately don’t have enough time in their lives to practice, either at a driving range or a golf course. More importantly, they also logically most often struggle with the full swing. When working with your instructor, there are definitely movements that can be practiced at home, without hitting a golf ball, and often even without a golf club. I personally like to have my students hold their TV remote control (or another household item like a spatula) to work on the full swing motions.
The full swing, despite its difficulty, is the simplest thing we do in the game of golf. The only variable is ball position (further left for right handed player with larger/less lofted clubs).
If we take an athletic stance, by kicking our butt back and tilting our upper body down with only a slight knee bend, we can effectively practice a good set-up position.
From there, I personally look to see at least a 90° turn with our shoulders on the backswing, all while maintaining that athletic stance with your eyes focused where the ball would be. This would point our lead shoulder at least to the golf ball (behind it if possible) with short irons, which are played from the middle of our stance in between our feet.
Regarding the finish, I like to see my students’ chest facing left of their target (again for right handed players) with the right foot up on it’s tippy toe. Our bodies stand up entirely on the finish, at that point we will not be bent over whatsoever. We should be able to comfortably hold our finish for an indefinite period of time.
The more work like this we do behind the scenes, without the pressure of a golf club and/or the ball, more good swings will show up when it matters on the range and/or the course.