I'm a huge proponent of weight lifting. I hate cardio. But I do know that if you only do lifting and don't do cardio, stretching, and the other boring stuff,

I'm a huge proponent of weight lifting. I hate cardio. But I do know that if you only do lifting and don't do cardio, stretching, and the other boring stuff, you will get less value from your lifting. You do the cardio to build more endurance, a stronger heart, and apparently a more efficient use of the oxygen in your blood. TFA didn't seem to be about weight loss; it was about declining health. And in that case, virtually any consistent exercise would be an improvement. Whatever it is that gets someone off their sofa regularly is a good starting point. If that activity is weight lifting, then perhaps they will enjoy the extra benefits of better strength, higher metabolism, a feeling of more energy, etc.