A personal trainer shares how to successfully perform circuit training and how it can help build your best abs yet.

Electricity can travel around the circuit. Let’s add another component. This is what a bulb looks like as a symbol. The electrical energy from the battery has been used to make the lamp turn on.

Adding more batteries to a simple circuit will increase the electrical energy, which will make a bulb brighter. Electricity can flow through the components in a complete electrical circuit.