Back in the day, I worked out at the gym for two hours at a time, four days a week
Monday, Tuesday, Thursday, Friday
Monday and Thursday were chest, shoulders, triceps
Tuesday and Friday was back, biceps, legs.
That was then.
This is now.
These days, my workouts are not so tightly regimented.
Basically, I work on whatever muscle group I feel like working on that particular day, and I try and hit everything at least once a week. Shoulders are something I try and do twice a week because I’m conscious of preventing shoulder injury due to pole vaulting. I also like to do something for my back twice a week, especially since I neglected back for a little while and lost the ability (again) to do pull-ups.
Oh, yeah, core is something I’ve started doing every day, or nearly every day, at the end of each workout.
As for how long my workouts last, roughly about an hour total, including warm-up.
Lately, I’ve been working to drop 15 pounds, so I’m starting things off with 25 minutes of intervals on the treadmill. I was starting off with stationary bike, but for some weird reason, I find it harder to go 25 minutes on the back than on the treadmill. Seems like it would be the other way around, but no.
Having said all that, I’m probably going closer to an hour and 15 minutes, including the longer cardio, which used to be 6-8 minutes or so, just to get loosened up and the ol’ blood pumping a little.
Some say a 30-minute workout is plenty. Some people I know — even older folks — are in the gym for two, two-and-a-half hours, but a lot of that time is spent socializing, if they’re being honest.
Basically, I’d say an hour, three to five times a week, is plenty, depending on what you’re trying to accomplish, of course.