You can lose weight exercising, if you’re willing to give up 3 hours a day to do it.

Actors are getting paid to work with a coach who is putting the through weight or strength regiments that are a part time job. It works for them because it’s all they’re doing.

If you want to walk or bicycle three hours a week then no, you aren’t going to lose weight from exercise.

You can burn a couple thousand calories in a day by walking or biking or running, but it’s going to color your whole day.

Great one. Not many people know this, or will even think it's nonsense. Exercise is overrated. What you eat is really, really important.

Exercise is great for a pile of things, to be fair. Losing weight is just not one of them.

It is just calories in calories out. Exercise may help with that. Depends how much you eat.

If you eat to lose weight and keep that up for a long time you will end up weak if you do exercise

Nice one. also if you see extremely fit adults, it is mostly because they were extremely active/fit during their teens. (note: inverse won't be true, active teens might get unfit later). Their current diet or current activity has nothing to do with it.

Is that causation or just correlation? Isn't it likely to be at least partially genetic - if you have "fitter" genes you are going to be fitter both as a teenager and as an adult?

It has a lasting effect on metabolism - i.e. in terms of 'calories in, calories out' as someone else put it, raising the rate at which calories 'go out' at rest.