Foundations.

Everyone tells you to be more disciplined. For most people that quietly fails — because discipline is the wrong tool.

Sleep isn't the opposite of getting things done — it's when your body installs everything you worked for that day.

Most people do one kind of exercise and wonder why they feel half-fit. There are four, each with a different job.

Everyone tells you to watch your calories. Almost nobody tells you what a calorie is — here it is, in plain language.