For most people, weight loss is 80% nutrition and just 20% exercise. It's difficult to lose 90 lbs through exercise alone, without also tackling the intake side of things. To put things in context, a rough rule of thumb is that you burn about 100 calories per mile walked, and a pound of fat represents about 3500 calories.
However, walking is a very good exercise - simple and requires no special training or equipment.
If you combine watching your intake with walking 2-3 miles a day, then that can create a good calorie deficit overall.
Also, any good exercise program includes BOTH cardio and strength training. Walking certainly ticks the cardio box, but you should add some strength training as well.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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