I do these at least twice a week, usually more, along with lateral cable shoulder pulls going both directions. For the static holds and the front arm pulls, I do two sets with 35lb. DBs. For the lateral shoulder cable pulls, I usually use 15-20lbs. and do three sets of 20 in each direction. Finally, I’ll do 40 shoulder circles, 20 in each direction. This routine takes me about 15-20 minutes and I’ll follow it with three or four sets to failure on the rear delt machine. That is my warmup routine for a dumbell chest day. It’s the only way my shoulders can take it.