Here is a very mental and physical drill. It is all of the scales connected and trilled.
Fast all you get to do is the written note a note above and the written note before you change to the next note of the scale.
Played slowly you get a trill workout.
When playing slowly do it 2 times so you can use both Baroque (Starting the trill above the written note) and the more modern trill Starting on the written note.
trills Click link for music.