5-6 days in a week for me... depending on my schedule, but going mornings is better because I don't get to miss out because of work or other commitments...so 5:45am-7:00am. The 1st 15 mins short sprints, skip, jump, bike or resistance running, followed by 45 mins weights, or without weights, I alternate each week ( this week with weights, the next without -body weight training is not easy).
On the 6th day usually sato mornings either jog/run like 8kms or gym just like the rest of the week, depending on my mood that day.
I have also done aerobics, its interesting if you get a trainer that really pushes you to the limit. I used to despise it too thinking its for chics but if you get the real deal you are in for a treat.
I watch what I eat, booze kidogo, sio kulewa chakara.
All in all, its never ending, with today's lifestyles exercising is not an option.