To improve her understanding of the common sense of bicycling: bicycling for ladies, lorena wrote this paraphrase of a sentence.

knowing when to lighten up on the top pedal requires practice.

which sentence is being paraphrased?

to learn to balance, have the saddle raised as high as possible, so that the ball of the foot just touches the pedal at its lowest.
the beginner usually exerts too much pressure on the pedals, and has to correct the falling tendency of the machine.
to take the pressure off the ascending pedal at the right moment is a more difficult matter.
when the pedal is at the highest point, the toe should be raised and the heel lowered.