I'm 62 and shot 68 at 30 for years and years. Now my spine goes straight up my back until it gets to my shoulders, where it takes a half moon curve to the right. I'm right handed. When the doctor and I looked at the X-ray, I had to laugh when he said, "look at that, what do you suppose caused that".
Now, I know your not going to drop down in poundage so this might answer your question, because you said you were going to do push-ups. Get in the push up position with a 15 pound dumb bells in each hand (the dumbbell weight can't be round). Do one push up and with your hands in the up position, do a press so that your right hand is towards the sky and your left hand balancing on the floor. Bring your right hand to the floor and do another pushup and then reach for the sky with you left hand (dumbells in hand all the time).
Think of the muscles that you use in archery and thnk think of the muscles you use in this exercise. It's a ball buster. I can do 100 push ups (only 50 with good form) and the first time I tried this I could do ten. Much more cardio than you'd think. I now do two sets of 12 in my workout.
Bowmania