Here's a study I can believe.
Scientists at the University of Alberta found that walking just doesn't kick it if weight loss and getting fit are your goals. You really do have to do some aerobic exercise to achieve that. That's borne out by my own experience.
I sent the link to my man who emailed back that he'd reached that conclusion but hadn't had sufficient motivation to do anything about it yet! I really have no ideas left for spurring him to take up a sport so I'm going to let it slide.
What I really need is a study that tells me exactly how much I have to sweat each day so that I can achieve my ideal weight (that's my ideal weight for me, not some BM index decided by a mathematical formula) and feel fit. Is it a cupful? A bucketful? Or a bathtubful? Or do I only stop when I have dissolved into a large puddle on the gym floor?