Take the dog for a walk around the block every day. And take the stairs instead of the lift when shopping. Get together with a group of friends and make working out a social thing. It'll be more fun, and if you plan it with others, you will feel obliged to go. So now you have your eating and exercise sorted out.
Positivity now takes the main role in the healthy lifestyle.
If you wake up one morning and decide that you will be negative and unhappy, then you probably will be. This affects that way you think, feel and also how others see you. There is nothing more unattractive than a miserable person. It's all a matter of changing your viewpoint. Try and find a silver lining in every outcome.