I have a multi gym membership with puregym, that costs me 24 quid a month and gives me access to 65 gyms. Loads of their gyms are on industrial or retail estates and have parking fairly close to them. I also have my bike with me and a resistance band so I can get stuff done when not near a gym. If you search facebook for truckers who run there’s loads of info on there about gyms with parking. Well worth a look. I even managed to go swimming tonight as a ended up near swimming pool. Beats sitting in the cab all night.