Losing weight is way more about diet than exercise. The body gets really efficient at doing repetitive motions and starts burning fewer calories for the same actions.
> In 2016, Pontzer and colleagues published a study putting forward the constrained energy model: Energy expenditure does increase with more activity, but only to a point. Once physical activity gets really high, the body will adjust other components of the metabolism to keep your daily energy expenditure within a narrow range
https://physiqonomics.com/biggest-losers/
https://www.theatlantic.com/health/archive/2012/07/study-off...