Is riding a bike good exercise?

[Music Fiend]

I've been riding a bike for the last few weeks and was wondering if it would have any effect of my fitness level. I was also wondering which muscles get exerted during the bicycle riding.

 

[Blue]

it works out your thighs mostly and legs

 

[Blue]

it works out your thighs mostly and legs

 

[Blue]

it works out your thighs mostly and legs

 

[Wivine]

yes it is, a it is a good cardio exercise because it's good for your heart