What's your favourite cardio machine?

Right now: treadmill and stationary bike. I have also used elliptical a lot in the past.

In general, In general, I think it's best to mix it up.

I loath indoor cardio machines and would much prefer to be on my road bike or mountain bike. It's winter right now so that makes things more difficult as it is dark in the morning and evening when I have available time, so I take a spin class once per week and use the spin bikes at the gym to do some moderate indoor cycling on another night. On weekends I like to get outside and ride if it's nice enough (usually is). I prefer the spin bikes to the usual indoor bikes.

I am not a big fan of indoor cardio. If I absolutely can't run or cycle outside I will run on the dreadmill or go to spin class.

Outdoor bicycles for preference, indoor bikes for training and avoiding poor weather conditions.

I can't say I like my rowing machine, but it helps keep me in adequate shape to row my rowing shell, once the river thaws out (then it sits idle all summer ). Spinning is fun, too, when stuck indoors.

You're right, the rowing machine uses lots of muscle groups. A thing to be aware of, though, if you do a lot of it, is that it's unbalanced: All lower body push, upper body pull. It's a good plan to add other exercise to balance out the muscle groups. Doing more with upper body push, particularly around the shoulders (for rotator cuff benefits), is especially important for injury avoidance long-term.

My road bike!

My bicycle. Outside.

My feet.

Stairmaster. nothing else gets my heart rate up so quickly. try walking quickly up a long flight of stairs and see how winded you get.

my 20 year old spin bike. (it sat lonely for 16 years)