A modern smart trainer will continually vary the resistance level based on software cues to simulate inclines, head/tailwinds and the effects of drafting. If your Zwift ride arrives at a steep climb, you'll need to downshift and get out of the saddle to keep up, just as you would do in the real world.

Peloton has a mechanical knob that controls the resistance.

It's clear that a lot of people love the Peloton experience, but it's a pretty lousy training tool for any kind of real cycling.

Modern trainers handle it just fine. I used to be a professional cyclist and would log about 20 hours inside/week during winter.

You can also get a roller with resistance, that is probably the best investment I ever made.

For people in the US I recommend http://www.insideride.com/ and in Europe the equivalent is this: https://www.elite-it.com/en/products/home-trainers/rollers/q...

That is a good question, I found a video where someone is using a Swift trainer and at the 2:52 mark they are out of the seat: https://www.youtube.com/watch?v=c-3-6KDu1fY

This question was asked numerous times on every bike/trainer related discussion board. They handle just fine. I have my carbon bike on a trainer like 5 years already every winter and part of spring