Pedal at a faster rate (cadence). You'll want to do at least 75-85 revolutions per minute.
Don't worry about how many calories you're burning per hour. Just ride often and build up a base and the pounds will start dropping.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.