What gear is best used to burn fat and tone up on the exercise bike?

Peach Roses

New member
Theres a little thing you can turn on my bike, one way makes it loose and the bike pedals move quickly and easily and then the other way is really quite difficult to pedal and almost stiff.

What do these settings do and which one is bst used to burn fat, tone up and for how long should i exercise on it? Thank you so much!
 
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