i use this exercise atleast 20 minutes everyday, to strengthen "the weaker side" which is yung left hand:
*capital letter = accented
singles: (combining accented and non-accented strokes)
8's L l L l L l L l L l L l L l L l , l L l L l L l L l L l L l L l L
7's L l L l L l L l L l L l L l , l L l L l L l L l L l L l L
6's L l L l L l L l L l L l , l L l L l L l L l L l L
5's L l L l L l L l L l , l L l L l L l L l L
4's L l L l L l L l , l L l L l L l L
3's L l L l L l , l L l L l L
2's L l L l , l L l L
1's L l , l L
then start way back up (1's, 2's, 3's, ..... 8's)
triplets:
rLL rLL rLL rLL
paradiddle-diddle (switching accents on all left notes):
Lrllrr, Lrllrr, Lrllrr, Lrllrr
lrLlrr, lrLlrr, lrLlrr, lrLlrr,
lrlLrr, lrlLrr, lrlLrr, lrlLrr