My flexibility is shit; I had some shoulder issues on my L side a few years ago that continue to linger. I do stretch but could be more regular about it. I do power clean and play basketball often, so explosive force production is something I have some familiarity with, I just have the sequencing out of order for my driver swing.
Couples swing is so effortless, it's beautiful.
My big issue is sequencing...in all those examples, once he completes the take back in his backswing, there is a slight pause in the club and he transitions his lower body weight to his front foot to start the downswing. I'm relatively good at that in my iron swing but for whatever reason in my driver, I'm not - my body wants to start the swing motion in the club rather than the lower body. As a result I get really "armsy" and disconnected between my upper/lower body as they try to fire together and it warps the swing and robs power at best, at worst it sends the ball careening off to the left or right or tops it.
On Sunday my wife and I golfed our "home" course at Avery Ranch (we're not full members there but it's closest to our house). It was like I had never hit a driver before in my life. Eventually I backed off to 50% power on my swing just to try to hit relatively straight-ish. Finally around hole 12 it started to feel right. My irons and chips were great and my putting was improved, I only 3-putted I think twice in 18. Finally on the last hole, it all came together. Decent if short drive, my 2nd approach shot I was about 10 feet behind a 10 foot tall bush with no view of the hole with about 140 yards to go, and I used my 9-iron and got great loft and got it up over the bush and landed about 12 feet from the hole, which I 1-putted for par. Felt really, really good to close out strong. My wife just texted me wanting to go to the range again tonight, she's got the bug!
Thanks for the drill, I'll try that out next range session. Maybe one of these times I'll get a recording and someone more knowledgeable here can give me some feedback?