Heavy exercise in general can mess with your periods, regardless of how you exercise. Usually through delaying them or in extreme cases cause them to cease entirely. Anyhow your body isn't clockwork perfect, and periods can shift a bit for no obvious reason.
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Talking about riding speeds and riding distances on a stationary bike is rather pointless because the bike isn't going anywhere, at any speed. If you're riding for exercise, count the time instead.
20 minutes.
It is Michelle Bridges from the Biggest Loser Australia. It may look like Ricky-Lee Salter but it isn't.
The revolutions per minute of a bike wheel depends on the size of the wheel, the speed you are riding, and other factors. It is generally thought it can spin at 2 revolutions per second.
26/52 = 1/2 mile per minute or 30 miles per hour