There is a method of training that combines both cardio and weights. It is commonly called circuit training. I play soccer, and I am also getting older--51 now. I have maintained my playing time by using this method. You use weights in semi-moderate levels, based on what you are capable of. I, for example, do shoulder presses--3 sets of 8 with 40 lbs dumbbells, get on one of those mini trampolines and run for 60 seconds, with no rest between sets. Then I do bent over rows with 60 lbs bumbbells, same amount of sets and go immdediately to the trampoline.Then I do abs, 3 sets of 15 reps, go to leg extensions on a machine, 3 sets of 15 reps(200), leg presses( 355), same amount of sets, then bench press, 3 sets of 8(170), and flys, 3 sets of 8(60), and end with tricep extensions(60), and bicep curls(40), all with the same 60 seconds of running on the trampoline in between with no rest--well virtually no rest--maybe 15 seconds or so. Off days I walk and stretch.I shoot a 80 lbs Tribute set at 74 lbs, and I have no trouble pulling slowly and with control. Many times I shoot immediately after training, to replicate the 'buck ever' that I usually experience when drawing on an animal. I would emphasis that it is good to do this for bow season, but better to adopt it as a life style change. The benefits are worth it.