Yes, I started a regular program of aerobic exercise 3-4 times a week and weight training 2x a week more than 20 years ago. Before that I spent a long time trying to find exercise that I liked well enough to stick with (that's the key, I think.) My choice has been using videos at home. The last 4 years I've been doing only the aerobics at home and going out to our local senior center (1/4 mile walk one way) for Strength Training classes--got too bored with doing it at home on my own.
Another way I prevent boredom is to mute the audio and listen to radio or audiobook (after I learn the routine and don't need the verbal cues any more.) My favorites over the years have been Jane Fonda's Low Impact Aerobics from 1986 or so and the Weight Watchers Low Impact Aerobics also from that era--both still available only on vhs
My current favorite is Leslie Sansone Walk at Home - 5 Day Slim Down - A Mile Each Morning, which doesn't appear to be available on Amazon UK. I do one of the 4 14-minute miles and finish up with the 12-minute speed walk.
Last week the NY Times had a 2-part series on falls among the elderly. One good way to prevent falls is to start exercising before we get elderly--Improves coordination, balance, and flexibility as well as muscles and cardio-vascular system. Sorry to go on a bit here,
but hope my experience is helpful.