Air Bike (Fan Bike)

How to adjust

Set the seat height so your leg is nearly straight at the bottom of the pedal stroke; there is no resistance dial since the fan creates resistance from your own effort.
If the saddle has a fore/aft rail, set it so that at the handlebars' farthest point your elbows stay slightly bent and you don't have to reach after them.

Set the seat height, then grip the moving handlebars with both hands.
Pedal while simultaneously pushing/pulling the handlebars to engage the upper body too.
Pedaling and pushing harder and faster automatically creates more resistance from the fan.

Pedal easy for the first 20-30 seconds before you push the pace, since the fan's resistance climbs steeply with speed — going all-out from the first stroke is how people strain a hamstring or blow up.
Keep both hands on the bars for the whole set: they drive back and forth with the pedals, so letting go mid-effort can let a bar swing into you.
When you run out of steam, wind the pace down before you take your feet off; the fan keeps spinning, so the pedals keep turning — don't try to stop them with your legs or pull a foot out while they are still moving fast.
Wait until the pedals have stopped before you dismount, stepping off to the front or the rear rather than climbing over moving handlebars.