The purpose of this screen is to inform and make you aware of the risks involved in returning to train
If 7 days post recovery and no symptoms then a gradual return to exercise is permissible but should persistent symptoms of breathlessness on exertion then you should consult your usual medical practitioner.
Not allowed to train until they have self-isolated for 10 days.
If you have an underlying medical condition that makes you more susceptible to poor outcomes with COVID-19 (including age >65) then you should consider the increased risk and may want to discuss this with you usual medical practitioner
This is an individual call but awareness of risks and the appropriate precautions should be taken. One dose of the vaccine significantly reduces the risk to a vulnerable person.
If additional explanation required in this circumstance and if understanding is not forthcoming they should be advised not to train.