I started doing this drill a few weeks ago and it has really helped.

When I you go to the practice range I start with my piching wedge and pitch to a 50 yard target. I usually Hit 20 balls concentrating on a smooth take away and follow through. The short distance gets me focused on accuracy vs.power.

Then I move to a 75 yard target then to 100. By this time I've grooved a nice flow to my full swing. because every shot feels like a longer pitch.

If I hit 100 balls in a day 60 of them will be spent doing this drill. It really helps your swing all the way up to your driver.

Hope this helps
Cheers