Hi,
My advice would be to get hospital-based work experience/health centre experience rather than sports. Most uni's really don't like too much emphasis on sports physio because that is such a tiny area of physio and something you won't even touch on at uni...it really puts admissions off if you say you're really interested in sports physio!!
Even a week or so in a hospital would be good, getting some experience in the different departments so you can show you've experience of different aspects of physio.