Can’t outrun a bad diet. Obesity starts and ends in the kitchen, not the gym.
If you burn 2,000-4,000 calories a day (or more!) like an elite distance runner or swimmer, you can outrun your fork.
e.g.: https://olympics.com/en/news/michael-phelps-10000-calories-d...
What's easier, saying 'no' to a coke, or talking yourself into the 1.5 mile run that's required to burn those calories?