Check the chain tension, this could be caused by the chain being too tight. Loosen the rear wheel nuts, slide the wheel slightly forward and retighten the nuts. See if that helps. If it is still hard to pedal then the crank's bottom bracket may need to be adjusted and could require special tools that your local bike shop would have.
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Check the chain tension, this could be caused by the chain being too tight. Loosen the rear wheel nuts, slide the wheel slightly forward and retighten the nuts. See if that helps. If it is still hard to pedal then the crank's bottom bracket may need to be adjusted and could require special tools that your local bike shop would have.