I ride my stationary bike at home. It was always the stupidest feeling for me to drive to a car park just so i could workout

Edit: I'll add if you have a bike already, they make basic stationary trainers for relatively cheap that you can attach your rear wheel to. Sometimes called bike training stands, they come in three styles:

• Wind (less common these days)
• magnetic (usually adjustable)
• fluid (more roadlike feel)

They can be between $30-100. And then if you end up liking it then they also have smart trainers that are even better but expensive up front.

For the bike trainer stands then if you like it get a training tire which is more durable than standard tires. And you're also going to want to find any fan and point it at you while working out.

If you miss the social aspect there are some apps like zwift, rouvy, etc that let you ride virtually with other people though $, and you'd also need some relatively cheap speed/cadence sensor hardware on your bike to send your speed/ cadence to send to those apps (this is not needed with a smart trainer). Because i hate extra subscriptions, I just watch TV or read a book (can be hard during a harder workout).

There's a lot more i could say but basically i started with a 30 year old bike on a cheap magnetic trainer. It wasn't the nicest set up in the world but it worked, and eventually i realized i liked it enough to just cut my gym free and save up for a nicer set up.