Exercise is a major key to fast weight loss and an effective way to lose belly fat.
Always check in with your doctor first – they may have some helpful advice which could support your weight loss journey.
Start small but START!
Walk, jog or cycle around the block or through the park. Find an all year swimming pool! Decide on three days a week when you can do this and stick to it. Find an exercise buddy who is on a similar weight loss journey to yours.
Time yourself and record it. This will show improvement and give you a boost.
When you feel ready, add another day or two a week OR throw in another form of aerobic exercise: Go dancing! 
Remember to use the stairs instead of the lift – get out of the lift one or two floors early and have a go! Catch the bus or taxi one stop or block earlier or later than you normally would.
Park the car at the edge of the carpark and walk.
Cut down on the times you have goods home delivered and go collect them yourself (especially if it is food!)