> RESISTANCE AND YOUR WORKOUT

If you’ve been checking out exercise bikes, you’ve probably seen some hype about magnetic resistance. In fact, virtually all exercise bikes create resistance with some form of magnetic brake. Your choice comes down to the types of magnetic resistance (standard or electro-magnetic) and the quality and features of the equipment.

Standard magnetic resistance is created by moving a powerful magnet towards or away from the moving flywheel. As the magnet moves towards the flywheel, the current generated between them increases—creating resistance. (If you recall your high school Physics, this is known as an Eddy Current.) On some standard magnetic exercise bikes, you turn a dial to move the magnet towards the flywheel and create resistance. On others, a small electric motor moves the magnet.

Electro-magnetic resistance is typically used in higher-end exercise bikes. This system doesn’t have a moving magnet. Instead, an electromagnet is positioned close to the flywheel, and current is passed through it to create a resistant force. The more current, the higher the resistance. Electromagnets are very controllable, offering a finer range of resistance adjustments than other magnetic systems. Electromagnets are also more durable due to having fewer moving parts.