At age 71 I hit the gym 5 days a week year round.
2x 25 reps- Back Extension machine with 150 lbs
2x25 reps Rear Delt machine with 80 pounds
2x 25 reps Abdominal crunch machine with 80 lbs
MWF Treadmill set at 3.5mph, first 5 minutes at 15 degrees elevation, drop to 12 degrees for another 23 minutes, then flatten it out for final 2 minutes.
TT Elliptical machine for 20 minutes with it set to keep heart rate in the 140s.
After getting home if it’s under 95 degrees I hike up the hill behind the house, 160 feet elevation with 110 ft in 1/4 mile. Hike across the pasture. Since the grass and ticks have come on I hold it down to 2 miles total. In colder weather where the ticks aren’t a problem it stretches to 3 1/2 miles.
The last few years pheasant hunting has been a piece of cake