Fan bikes are a great way to get a tough workout. They can really get you exhausted fast. It’s for this reason they can be great for high-intensity interval training and conditioning. One of the reasons is the air resistance the other is that you are working your arms and legs at the same time.
It’s a retro piece of equipment that has been reborn in recent years. It’s like a standard stationary bike but instead, the wheel is replaced with an oversized fan adding resistance, and it really does. Pedaling your legs whilst pushing with your arms spins the bike's fan. Then you see the quirk of Galilean aerodynamics that makes the airbike so revered – the harder you pedal, the harder it gets.