I do what Charlie lamb says. I keep my bow strung and pull it a few times each day. Years ago when I was alot younger I shot a 80# Black Widow, don't ask me why, And I used to do simple pushups and pull my bow each day. Oh yes, pull it with both hands. I learned that from an old Price Albert VHS on building archery muscles.
No, I donot shoot that much weight any more. At 63 years old I am shooting bows between 55-65lbs. The 65lb. bow is getting to the point where it will be a workout bow only soon. It is funny how life can make a full circle. I shoot my 55lb. bows alot more these days, same weight I started with in high school.