Exercise for Weight Control

Walking

Walking is great. No expertise or equipment is required, you can do it anytime and it's free! What's more, provided you do it regularly and for long enough, walking can be just as beneficial as any of the more vigorous activities (like jogging etc).

How to start
Take a 10 minutes walk, twice a day.

Gradually extend yourself
Walk every day
Walk longer
Walk faster
Walk and swing your arms at the same time
Walk up one or two gentle slopes
Walk up steeper slopes

Ideally
Aim to walk briskly (swinging your arms) for 30 minutes, each day. This should include at least one reasonably steep slope. Please note: This may take you several months to achieve, so don't be in a hurry. Remember, exercise is for LIFE!
Swimming

For most people, especially those who are very overweight, swimming is even better than walking.