Went to our nieces’ cheer competition at a local arena and boy did I have to fiddle around with settings to get decent pictures. Not very good, but a few turned out ok:
http://i.imgur.com/fxgfKPI.jpg
1/400 f/5.6 iso 5000
http://i.imgur.com/smNBLIJ.jpg
1/500 f/5.6 iso 5000
Gear I was using:
EF75-300mm f/4-5.6 USM
Canon 80D (wife surprised me with this last friday, previously had a t5i)
So, I’ve found, at least for me, shooting indoors is a lot harder than outdoors…