The best exercise for weight loss according to research, is strength training. This is followed by interval training, fast cardio & slow cardio.
While liposuction & tummy tucks give a flat stomach immediately, these are not sustainable. This is because you are only treating the symptoms & not the root cause.
Starting weight training for beginners requires you to understand reps, sets and tempo. You must also be able to assess what weights to start with and when to increase weights.
Weight training for women tremendously increases quality of life. A trained 65 year old could have the same quality of life of as a sedentary 35 year old.