1hour, 3 times a week of moderate aerobic exercise such as jogging, cycling,swimming or playing a sport is recommended for people trying to lose weight, increase their fitness or manage hypercholesterolaemia or diabetes.
20-30 mins a day of light activity (walking, yoga, pilates, Tai Chi) is the absolute bare minimum of what a physically capable person should be doing. If you walk to and from work or a bus-stop or subway station, or walk to your local deli for lunch, or climb stairs at work, you’ll be doing that amount without even thinking about it.If you drive to work and have a sedentary job, or work from home, you may need to schedule your exercise in.
In addition 1 hour a week of aerobic exercise and 30mins of strength or weight training will keep you in tip-top shape. Again, playing with your kids, walking or jogging with your dog, and making beds/doing laundry or carrying the groceries in from the car might mean that you do this without thinking, otherwise schedule it in.
This is info from our Physiotherapy department, who tend to know what they’re talking about, but I’m sorry, I don’t know exactly where these recommendations come from.