I do not use the OW for warm up, instead I swing it every evening for about 20 minutes non-stop. Although 20 minutes may not seem long, I can assure you it's a good workout. I focus on using the clubs momentum to lengthen my swing (both backswing and finish). I also focus on starting the downswing from the ground up. In focusing on those things it has had the added benefit of improving my swing tempo.