(This is going to sound ironic since I started this thread knowing absolutely nothing about training)
Cardio/respiratory/metabolic fitness goes away quickly but it is also comes back quickly. Dont be depressed, you will be better at this than previous times. Just go easy, progressively increase your workload based on your tolerance. If you feel terrible/full of fatigue, skip cycling for a day here and there or do a light easy spin as active recovery. Over time you can build more and more capacity for workload. Do more and more in a concentrated time frame. Think not about what you can do in the "current" session of riding/training, but more several weeks ahead. Do today what you need to be able to let you do more next week, and more again the week after.
(This is going to sound ironic since I started this thread knowing absolutely nothing about training)
Cardio/respiratory/metabolic fitness goes away quickly but it is also comes back quickly. Dont be depressed, you will be better at this than previous times. Just go easy, progressively increase your workload based on your tolerance. If you feel terrible/full of fatigue, skip cycling for a day here and there or do a light easy spin as active recovery. Over time you can build more and more capacity for workload. Do more and more in a concentrated time frame. Think not about what you can do in the "current" session of riding/training, but more several weeks ahead. Do today what you need to be able to let you do more next week, and more again the week after.