Can you help me understand the gears on my Shimano 21-speed Mongoose bicycle, please?

the phoenix

New member
Why do i sometimes need to push down REALLY hard, and sometimes im "Right in the powerband" and sometimes even selecting the SAME GEAR feels different?

I bought a Mongoose "Estes" bike AND another one both 26" Mens frame. Is there some "Trick" to get it to go the fastest, and easiest? Sometimes it feels as though it is resisting me?
 
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