Well being 63 YO and retired I concentrate on exercises that helps my two hobbies which are: hunting and then some more hunting.
I jog slowly about 3 miles of up hill and downhill some few days of the week and if my knees or the weather gets bad I will just hike around for an hour or so on other days. I do some upper body exercises so I can pull my 70# bow and hold it for three or four minutes. I have an old bow that I use for exercises some times but I find an old bicycle inner tube cut for a stretchy device to be a good substitute for it. It is also good exercises for IPSCA or IDPA.