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As Andy says a surprising amount of base needed.
Secondly however base training also happens to be great training for generally being a healthy functioning human I find which I am a huge fan of.
I will also add I generally love sitting on the turbo for 1/2 hours midweek as bang for buck is unrivalled. I have a family and I tend to enjoy spending time with them, turbo allows more of that
How much base do you need for ~1 hour CX races?
For me, the turbo is only bearable if I feel like I’m getting the benefit of working at or above threshold.