I am not a physician and the following are only my opinion and what worked for me. Remembering to get professional advice before proceeding in any physical activity for an increase in strength.
First you are going to have to be completely honest with your self on what you can handle accurately (something we sometimes have a hard time with if ego or macho gets in the way) in poundage to consistently hit your mark. You can use the same science to build the specific muscle groups involved in to shoot a traditional bow as in any body building but concentrating on the muscles involved with drawing/pulling aiming/holding and releasing your string to allow the bow to finish the job of sending the arrow to your target. Do not use more force than is necessary than to trigger the growth mechanism and build an inroad, then rest enough to fill the hole you just dug to gain strength (thus regulating your volume and frequency for proper recovery). If your body has the rest it needed you will notice the increase in strength and proceed taking the time necessary to do it properly and not hurt yourself. It only takes one properly done set to momentary muscular failure to stimulate growth for an increase in strength and size usually goes along with it (IMPORTANT do not dry fire your BOW when attempting this). You have to choose your proper weight selection for reps to momentary muscular failure to trigger the growth mechanism then once strength increases adding additional weight. Remembering that the role of genetics plays an important part to how strong an individuals potential is for how strong one can get and every body has different limits of capability. I worked up to 68# @ 32" for my limit for accuracy. I did believe that the extra weight helped the arrow in kinetic energy. I handled this for many years until aggressive degeneration took over my body and I am going with less weight to keep hunting Traditional versus going with one of them cro**guns. I can not stress enough to get professional advice before going on any training regimen so you know how to and sure you can handle it. These are my thoughts and what worked for me and take it for what it is food for thought and a place to start.