I agree with nvguy2!
Start with reduced draw weight & regular exercise.
Depending on your age, it may take longer but start slow & work your way back up.
I have a Mathews Switchback XT @ 70 lbs.. Due to lack of luck in the elk draw, and a nagging shoulder issue, I hadn't shot it for several years.
I found out in March that I drew an archery elk tag. Then I found out that I could not draw my bow at all! (My wife warned me that this was going to happen!) Darn age thing is really starting to tick me off!
I was able to back it off to about 60 lbs. and started shooting again. I started with shooting only 12-18 arrows per session, and only shooting about once a week.
That was back in April.
It has taken awhile, but I was able to slowly come back to pulling 70 lbs. comfortably. I still only shoot 18-24 arrows per session and I only shoot 1-2 times per week.
All I have to do now is:
call in a record class bull,
1/4 mile from the truck,
on level ground,
standing still,
at 40 yards or less!
Good luck!
Elkchaser