My Brother in Law had it. He's older, was in the hospital on a ventilator. Doctor told him after it was done that his lung function would likely be permanently reduced by 25%. COVID messes up your lungs. Not saying you will have the same long term effect, but it's not just the common cold you are used to and then jump back into training. It may take a while (months even) for you to get back to where you were. Start slow and work into it.