How to keep fit?

Solution-d less-weight problem, if your mom can bear with ingestion of wild, should be able to reduce the fat. Daily food for dinner before I can eat 8 bowls of rice so much, IKEA could only eat 1 Bowl. I, from 2012/1/1 252.2 lbs (114.4kg) reduced to now 155.8 lbs (70.7kg), loss 96.4 lbs (43.7kg) (38.2%). Waist circumference by 2012/1/1 125.8cm (49.5 inches) down to now 72.9cm (28.7 inches), loss 42.9cm (20.8 inches) (42.0%).
Here is my way to lose weight:
1.7.00km/h speed walking for an hour;
2.30min-60min continuous swimming (1 hour).


Exercise minus the body weight and food intake minus the weight ratio is 1-to-8 (11.11 to 88.89).

My mum want to keep fit.What can she do ?
Majority is to keep going on exercise movement.