Your bones and joints work together as a system of levers. Your bones act as the rigid bars, your joints are the pivots (or fulcrums), and your muscles provide the force to create movement. Understanding this allows you to manipulate exercises in clever ways, making them harder or easier without adding a single weight.

The key to this manipulation is a concept from physics: torque. Torque is the rotational force that makes a lever turn. Think about using a wrench to tighten a bolt. Pushing on the handle creates torque, which rotates the bolt. The amount of torque you generate depends on two things: how much force you apply and where you apply it.

The formula tells us something crucial: a longer moment arm means more torque for the same amount of force. If you grab a wrench near the head, you have to push much harder than if you hold it at the very end of the handle. Your body works the same way. By changing the length of the moment arm—by extending a leg or shifting your hands—you can dramatically increase the torque your muscles must overcome.

In bodyweight training, progression isn't just about doing more reps. It's about increasing the mechanical challenge. You do this by systematically increasing the torque required for a movement. Two primary methods for this are extending your limbs and shifting your centre of gravity.

Let's consider a front lever. In the initial 'tuck' position, your knees are pulled into your chest. Your centre of gravity is very close to your shoulders (the pivot point). This creates a very short moment arm, so your back and core muscles don't need to generate massive torque to hold the position. To progress, you slowly extend your legs. Moving from tuck to advanced tuck, then to a one-legged extension, and finally to a full front lever progressively lengthens the moment arm. In the full position, your centre of gravity is much farther from your shoulders, demanding enormous torque to counteract gravity.

Another crucial concept is the difference between open and closed kinetic chains. A [{] exercise is one where your hands or feet are fixed against an immovable object, like the floor in a push-up. An open chain exercise is where your hand or foot is free to move, like in a dumbbell curl or a leg extension.

In closed chain movements, shifting your body's position relative to your fixed hands or feet alters the leverage. The [{}] is a perfect example. You start in a standard push-up position. To increase the difficulty, you simply walk your feet back, so your hands are closer to your hips. Your body leans forward, shifting your centre of gravity towards your head. This drastically increases the moment arm relative to your shoulders, making the push-up exponentially harder and preparing you for advanced skills like the full planche.

Throughout all these leverage manipulations, maintaining core stability is paramount. A solid 'hollow body' position, with a posteriorly tilted pelvis, creates a rigid lever out of your torso. Without this stability, your body would sag, leaking force and compromising the movement. This rigid structure ensures that the challenge is directed to the target muscles, allowing you to effectively manipulate torque and progress safely.

Time to check your understanding of these mechanical principles.

Mastering leverage is the key to unlocking advanced bodyweight strength. It turns your body into its own gym, with endless ways to increase the challenge.