Also, you have to have a bow that fits you before form even comes in to play. If you can't draw the bow back, what does form matter?

Good advice above. I too think you have too much bow and too long of a draw length. If a pro shop sold you that bow, don't go back except to get your money back. If you bought that bow on-line or from a buddy, you made a mistake. Go to the nearest pro shop and get some face to face advice.

Nothing you will read on here will replace a lesson in person.

Forcing yourself to shoot a bow you cannot draw properly is a huge mistake. You will always have bad form. Get a lighter bow. Exercise is not going to get you shooting that bow well. You need a bow that you can draw while pointing it towards the target. Shoot the he11 out of it. When it is way too easy to draw that one, buy a bow with a heavier draw weight. Your current situation is going to lead to frustration and a crappy experience.

is not a natural move, like picking up a bottle of soda. kidding!

But, it isn't unheard of to do some weight training. Been working with five pound weights at the house for over 20 years. Had injury and illness prevent me from drawing a bow.
The weight training just doesn't come with the bow advertisement.

One of the best and simple "tools" I have used through the years to build up and keep in shape the muscles used in shooting a bow is simple rubber resistance bands/tubing. Just about any physical therapy center can hook you up with these. I tie a loop in both ends of the tubing to form the handles, Put both handles together, then tie a knot to be used to secure the bands. This knot can be placed in a door frame and close the door to secure. Simple and very effective.

First, as BG noted, you got mighty long arms for a 6 footer. Your draw length was measured at the archery shop?

Second, pulling a bow takes strength not usually used and needed by most people. The last thing noted by archery companies is a certain amount of strength is required.
Been working out every week, for some twenty years, with 5 lb weights. Usually use them in a archery draw. Otherwise, for me, not a lot of reason to push myself. I got an old body.