I'm an old man of 71. My pre match routine is to touch my toes and stretch backwards a few times. Hold the driver with my elbows behind my waist and turn to point it backwards 90* each side. Hold the driver behind my shoulders. take my stance then point the grip then the head at an imaginary ball position. Hold each position for about 10 seconds with about 5 repeats of each stretch. Slip a weight onto my driver and do slow motion swings pausing to stretch the muscles at the top of the backswing and the follow through.

A couple years ago I did tear some laterals around my hips and abdomen so I have learned my lesson!

D