I'm lucky enough to be able to get my cardio and strength training in while I'm at work (I have a treadmill in my office, and I do pushups, crunches, and triceps "supersets" throughout the course of the day).
So, when the weather is good, I shoot my 3Ds when I get home. I usually only shoot about a dozen arrows per night, and of course I try to make every shot count (I shoot compound, bare bow, with fingers). I do not like to overdo the shooting, because of a somewhat bum right shoulder. By the time Season rolls around in late August, my shoulder usually feels pretty good, along with the rest of my body. That's what works for me!
Best of Luck.