The Concertina Hand Teaser
This is a series of short hand teasers derived from endurance exercises I've come across in George Lawrence Stone's Accents and Rebounds, Joe Morello's Master Studies, and Allan Dawson's The Drummers Complete Vocabulary.. three of the great teachers of drumming and rhythm, in my humble opinion.
||: R L R L | R L R LL | R L RRLL | R LLRRLL | RRLLRRLL | R LLRRLL | R L RRLL | R L R LL :||
||: R L R | L R LL | R LLRR | LLRRLL | R LLRR | L R LL :||
(think of this one in 3/4 time, and the sticking alternates with each bar)
||: R L | R LL | RRLL | R LL :||
They're pretty simple, so play them as fast as you are able to and see if your brain can keep up... good luck!