Gyms, clubs and venues have measures in place to keep people safe from coronavirus. They might have limited space for new members because groups or classes are smaller. Or they might be running sessions virtually instead of in person. If you're not comfortable going indoors, there may be outdoor activities you can try.
If you are worried that an activity is not accessible for you, try speaking with the organiser. They may be able to adapt things to suit your needs. Remember that you have a right to reasonable adjustments so that a service is accessible to you.
It could be disability discrimination if a venue, club or sport is not accessible. For example, if you are unable to access an online booking system. Or there is no ramp for you to access the building.