The fitness industry is full of articles, videos, and statements with the same boldness of the title of this blog post.
"The best diet plan"
"The best workout"
"The best equipment"
"The best shoes"
And the list goes on.
The problem with articles and statements such as these is that they are just not true. Human beings vary widely on many levels. Our bone structures, digestive systems, the way we adapt and recover from exercise, the type of clothing that we find comfortable, the type of exercise that we enjoy, our taste preferences, our muscular development and imbalances, our lifestyles, and many more factors, all differ from one person to the next. This is why blanket statements that claim to be applicable to everyone are unreliable.
Take nutrition/diet as a great example of this: Depending on where our ancestors developed, our digestive systems vary greatly from one person to the next. For instance, a marathon runner from East Africa has a certain diet that he has been sticking to his whole life, based on what is available to him and his culture. His digestive system is accustomed to his diet and it is likely what works best for him. On the other hand, an American runner with a European background, has likely lived his whole life with a very different diet. His digestive system is accustomed to different foods than the East African runner. These differences are largely correlated with what these individuals have grown up eating, but there is also a genetic component. People whose ancestors come from areas where milk was not a common food item, can often be more predisposed to being lactose intolerant. Likewise, people whose ancestors were not used to eating a lot of red meat or bread, may find that their digestive systems are sensitive to those foods. The point is that our genetics and our backgrounds can often play a role in what we can and what we like to eat. With this in mind, how can anyone claim to have the "perfect diet for everyone"? How can you apply what works for an American runner to an East African runner? Or vice versa? And these differences don't just exist between people from completely different countries. Drastic differences can even exist within the same family.
Another example of this is running shoes. As a coach, I often get asked, "What kind of shoes should I get? Adidas? New Balance? Saucony? Asics? Brooks?" The truth is that all those brands make good shoes and whether one works for you, while the others don't, has nothing to do with the brand of the shoe. Each shoe varies in toe-box size, width, lacing system, cushioning, etc, and no one brand of shoe works for everyone. None. Ultra-cushioned shoes like HOKAs might work great for one person, while they might injure another. Minimalist shoes might be injury-inducing nightmares for one person, while being the most wonderful thing for another.
The big picture here is that the fitness industry is riddled with individuals who make broad, bold, blanket statements that are meant to shock and awe, and get people to buy into their idea. Unfortunately, those statements often don't work for everyone and can even lead to injuries or problems. It is best to research, ask around, learn as much as possible, and try different things. You'll eventually find what works best for you!