Interesting! That's exactly what I've been doing over the last 2 weeks.
Google 'bowyers diary' to see the last few entries.
Check out this video, you can see the draw almost stalls and then I get the right elbow to move down and back to get the last few inches.
http://s411.photobucket.com/albums/pp195/Del_the_Cat/websitevideos/?action=view¤t=MRcopyvid.mp4The next video shows how I struggled when I started.
http://s411.photobucket.com/albums/pp195/Del_the_Cat/websitevideos/?action=view¤t=2shots.mp4I started with 10 pushups night and morning and worked up to 20.
I've also invented a nice exercise for those last 2 inches of draw.
Stick you elbows out to the side and lean back into an open doorway with your elbows against the door frame preventing you from falling back.
Use your back and shoulders to lever yourself forward and backwards, move your feet further forward to make it harder.
Be warned shooting the 90# has made the knuckles on my right hand are sore and slightly swollen and I feel like I've been knifed in the right shoulder!
Some of the battle is psychological, once you know you can get that elbow back then it helps. I also found it easier to shoot high, flight stlye.
I start the draw low, breathing in as I draw, pull high and then come down again for the last couple of inches.
A couple of times I could feel my left elbow collapsing and found I had to almost lock it straight.
My regular bow is 50#, but I have an old Yew longbow which is 70# (actually68#) and was good for training up to the 90#.
I think the jump from 50# to 90# is too much unless 50# is easy.
The 70# takes a bit of warming up and I'd say 70-75 is a decent respectable weight to master first.
Most target archers increase weight by just a couple of punds at a time.
I shall probably only shoot the 90# a few more times to try for distance now I can get it back a full 28" before it goes to it's new owner.
Beware of thinking your normal draw length will apply at 90#, as there is a fair bit of compression in your body and 28" suddenly feels more like 30"
BTW... I just turned 60, so I have some excuse for struggling
Hope this is of some help.
Of course the other answer is to take a few good scrapes with a scraper down the belly of the bow, it won't take muck to scrape 5# of it.
Del