F.R.I.E.N.D.S Intelligence

Sleep: The Ancient Contract This chapter helps you get better sleep. But before we dive into specific advice—like avoiding coffee late in the day or keeping your bedroom dark and quiet—it is worth taking a step back. To truly understand sleep, we need to look at what it actually is and why it exists. Sleep presents a paradox. It appears to be highly costly. A creature that spends a third to half of its lifetime sleeping is giving up a significant amount of time that could otherwise be used to gather food, protect itself, or reproduce. In other words, sleep time is not spent improving its chances of survival or spreading its genes. From this perspective, sleep seems inefficient. Evolution is often understood as favouring traits that improve survival, responsiveness, and reproduction, yet sleep appears to reduce all of these. A sleeping creature is slower to react and less aware of danger. If a behaviour consistently reduced survival advantage in this way, we would expect it to be minim...

The Dynamic Intelligence Training Wheel After introducing the Fitness Bank concept, we answered why we need to train. With the Goldilocks Training Zone concept, we have a sense of how much load to apply. The remaining question is straightforward: what exactly should we train? What kind of exercise should we do? This section focuses on answering that question. It introduces a simple mental model for selecting exercises. Many people train without a clear framework — focusing on a single type of activity or following social media trends without understanding them. Over time, this often leads to imbalance or inconsistency. To assist, the aim here is to provide a practical way to make training decisions. With the proper structure, it becomes simpler to establish a routine that is both effective and sustainable — one that enables you to make steady deposits into your fitness bank over time. Before introducing the mental model for selecting exercises, one principle comes first: the best exer...

The Fitness Bank Account After introducing the concept of the Goldilocks Training Zone, a question naturally follows: Why train at all? There is often an unspoken assumption that people should exercise regularly. But why? Isn’t exercise simply one of many hobbies? One way to think about it is that fitness behaves like a bank account that builds biological capital over a lifetime. Many people look at exercise only through its short-term outcomes. They might train to lose weight, improve their appearance, or perform better in a particular sport. These are peripheral. The deeper value of training is that each workout adds something to your long-term physical capacity. In other words, every session becomes a small deposit into a personal fitness bank. Each individual deposit can feel quite small. A short run, a strength session, or a bike ride rarely feels life-changing. But when those sessions happen week after week and year after year, the effect begins to add up. Over time, they build ...

The Six Steps to Discover Your Godilock Training Zone Now that the Goldilocks Training Zone has been defined, the next natural question is how to find your own. The key idea is that there is no universal Goldilocks Training Zone. It is simply not possible to design a training program or structure that works for everyone. Although many online programs claim to offer the best routine for a certain age or gender, this is usually an oversimplification because people’s situations vary widely. Each person has a different training history, recovery capacity, lifestyle, and level of stress. For this reason, the Goldilocks Training Zone cannot be prescribed in advance; it has to be discovered through experimentation. Finding it is a personal process, much like figuring out your best daily routine, the kind of occupation that suits you, or the music you enjoy most. You have to discover it yourself. The good news is that the process is quite simple and can be learned. In the following section, I...