I didn't say the NHS does not help weight loss. They do their best, but the referral scheme falls apart because virtually no one gets past the 1st couple of sessions simply because most of the referrals are for people already so overweight that any kind of exercise becomes a huge test of willpower.I refer patients to Exercise referral schemes (paid for by the NHS), where they are guided (by a personal trainer\gyminstructor) through a 12 week exercise programme (for a nominal amount of money) so they can be shown how to use the gym equipment, have a tailored programme for them to help them reach their goals and to provide them with good habits for the future..... so you are wrong that the NHS does not help weight loss.
Ask anyone who works for or regularly visits the gym.
Exercise has many benefits but on it's own will not bring about significant weight loss. People have to reduce carbs and fats to lose weight. I agree that everyone, whatever their size, shape or age should exercise, for a start it's about the only thing that materially helps to avoid or even reverse osteoporosis, particularly for post menopausal women.