I am new to the Zwift community and have started doing the 4 week FTP booster training program, which always uses ERG mode. I’m not sure I’m “using” it right, and am having a few problems. I understand the trainer is supposed to change resistance for me and I’m not supposed to change gears.
No matter what, I can never seem to keep the cadence that Zwift wants. On my screen is a constant “spin faster” or “spin slower”.
In sprint efforts, I don’t see how it’s possible to generate the power Zwift wants while keeping cadence roughly the same. For example, if I have to try and put down 500w at 100rpm for 30 seconds, I’m finding it impossible. I can only generate that much power if I am spinning at 120-150rpm (basically as fast as I can possibly go) and still am coming up short in power. The “spin slower” alert flashes the whole time.
I can change gears and get up to power easily, but then my cadence is too low and I get a “spin faster” alert. If I spin faster and use more effort, then my power is way too high and I get a “reduce power” alert.
Is there a way to do this better? I’m finding I’m getting exhausted just chasing the cadence numbers and it is an annoying distraction. I have an older style triple chainring up front and I typically start my workout with it in the middle and halfway through my gears in the rear just so the chainline is roughly straight. Should I be starting in my big chainring instead?
(Cycleops Magnus trainer, FYI.)