Look at your local hospital website - some areas have a scheme for aspiring medics - you might be lucky enough to be in an area where this is linked to a uni..
Volunteering in a hospital, care home, or other health setup - or in a crèche, school, etc.
Basically anything working with the public is useful. It’s harder to get specific health related experience at the moment due to covid. I talked about my part time job in catering (teamwork, communication, dealing with disgruntled customers) and sports coaching, and helping in an after school maths revision club at my med school interviews more than I talked about the small bit of medical work experience I managed to blag.