Is riding your bike for about 40 minutes a day good cardio?

[uomo italiano]

consits mostly hills. so is riding my bike a good idea? for about 40 minutes.
it will be pretty fast, i don't go slow on a bike

 

[vpp2100]

yeh will burn 200-600 calories depending on speed

 

[Ima Thug]

make it an hour and you'll be good to go

 

[Jonathan]

there's no such thing as a bad work out (unless of course you hyper stretch)
so yeah, it helps!

 

[Freefly]

As long as you ride aggressively, enough to break a sweat, it's awesome cardio. Not much stress on the joints.