Ensuring you get quality rest and quality nutrition is the best thing you could do with only 4 days before the session. The mental agility you'll need will be sharper if you're not tired from squeezing in a load of training.
It's too late to do anything about fitness or strength specifically for this session, a few gentle rides will be fine but not at the expense of a few decent night's sleep.
Your very first indoor session is unlikely to be particularly physically taxing unless you are *very *unfit.
Ensuring you get quality rest and quality nutrition is the best thing you could do with only 4 days before the session. The mental agility you'll need will be sharper if you're not tired from squeezing in a load of training.
It's too late to do anything about fitness or strength specifically for this session, a few gentle rides will be fine but not at the expense of a few decent night's sleep.
Your very first indoor session is unlikely to be particularly physically taxing unless you are *very *unfit.