Over the years, I realised that exercise has to be be enjoyable and part your lifestyle. Anything too boring/exhausting/too challenging does not last.
So a year ago, I started 3 different exercise classes:
Pilates, indoors cardio walk, and outdoor nordic walking.
Really enjoy the cardio with music and enjoy the benefits of Pilates classes. Outdoors is lovely...but it has been a cold winter (not so enjoyable).
But yes, a year on I'm still doing it, still enjoying it and occasionally do my own bits at home when I feel better...
If I was still working full time, I'm not so sure I would have been able to keep it up though, fun or no fun!