Hi...

I'll say it right from the start, you could potentially be a fabulous climber without having done any training on hills. Key word is, potentially, because it depends on a lot of things.

The big difference between riding hills and flats, is that while climbing you tend to have much more of a steady and consistent resistance. That means your power (output), is also more steady vs. the flats, where you can easily coast and soft pedal.

In addition, air resistance and drag become minor factors while climbing, whereas in the flats they are very substantial.

So back to your question....you want to climb well but don't have hills? I've got ideas for you.

1 - Get real friendly with headwinds, hard as it may seem, they can be beneficial because they mimic the more steady resistance you would get while hill climbing.

2 - Even easier, get an indoor trainer - that will give you very steady resistance with no worries about terrain, etc.

One other thing that is very important, that is having a good set of gears. Having a good granny gear will allow you to keep your cadence higher and spare your legs from having to crank out lots of force to turn the pedals. A 25 is fine but you may find a cassette with a 27 is even easier - no shame in sparing your legs!

There have been tremendous climbers in the professional ranks who originate from places devoid of mountains.

The bottom line to climbing is power to weight ratio.....more power and less weight will get you to the top faster, easier, and more comfortably.

Best of luck to you for that ride!