Have a team that are all about shoulders? Here is a fun, competitive drill that focuses on booty blocks and hip checks, while experimenting with ways to avoid blocks.
At the Jammer line, split your skaters into 2 lines off to the side of the track. Nominate one line to give hits, and the other line to avoid hits. The only legal hits are booty blocks and hip checks.
On the whistle, the first pair sprint off and perform their job - use booty or avoid it. They only have one time around the track to execute a hit before they come off and rejoin the lines.
This is a great drill to run through a few times, as it gets really fun, really competitive and gives skaters a good go at both skills.