>Here's a rule of thumb: exercise very hard for one hour (swimming, running, or racquetball) and you'll lose about one ounce of fat. Light exercise for an hour (gardening, baseball, or golf) will lose you a third of an ounce. Want to lose a pound of fat? You can work it off by hiking to the top of a 2,500-story building. Or by running 60 miles.

https://muller.lbl.gov/TRessays/22-ThePhysicsDiet.htm

Caloric restriction is the way to lose weight. If that knowledge is not enough, and a book doesn't fix the problem, the solution is likely a regiment, program, club, routine, or subscription. Enter Weight Watchers. https://health.usnews.com/best-diet/weight-watchers-diet https://health.usnews.com/best-diet/best-weight-loss-diets

If paying money to a service to help you count calories does the trick, it is the answer. Food consumption routines and subscriptions should be allowed, because despite being profitable businesses, they also are beneficial to society. It may or may not be hard for WW to deliver its message around this ban. I would hope that Pinterest has somewhat flexible rules, and makes good judgement calls when something is close. I personally would err on the side of allowing WW to advertise, without letting it be a slippery slope back to snake oil.

Ads in question are most likely not about treadmill but high-margin supplements / meal substitutes with dubious results.