the idea is to not only practice scales but variations on those scales, both in terms of rhythmic ideas and interval ideas as well as a range of tempi (the plural of tempo). You should also practice with either hand. The examples given below cover a single octave of the scale from above - you can extend these to two or three octaves as you wish
e.g.
interval variations
straight up down
C-D-Eb-F-F#-G-A-Bb-C-Bb-A-G-Gb-F-Eb-D-C - note that Gb=F# going up it is F# going down it is Gb
in ascending 3rds
C-Eb-D-F-Eb-F#-F-G-F#-A-G-Bb-A-C-Bb-D-C-D-Bb-C-A-Bb-G-A-F#-G-F-F#-Eb-F-D-Eb-C-D-Bb-C
in ascending 4ths
C-F-D-F#-Eb-G-F-A-F#-Bb-G-C-A-D-Bb-Eb-
rhythmic variations
2 notes per beat
straight 8ths
triplet 1/4-triplet 8th
triplet 8th-triplet 1/4
dotted 8th-16th
16th-dotted 8th
3 notes per beat
triplet 8ths
8th-16th-16th
16th-8th-16th
16th-16th-8th
4 notes per beat
straight 16ths
triplet 8th-triplet 16th-triplet 8th-triplet 16th
triplet 16th-triplet 8th-triplet 16th-triplet 8th
triplet 16th-triplet 8th-triplet 8th-triplet 16th
triplet 8th-triplet 16th-triplet 16th-triplet 8th
6 notes per beat
triplet 16ths
you can extend the above with 32nds (triplet and dotted), dotted 16ths and even slow it down so that you have these phrases over 2 beats instead of 1
Tempo variations
work at everything from 48bpm to 136bpm in increments of 6 to begin and then increments of 4 later
48bpm, 54bpm, 60bpm, 66bpm, 72bpm, 76bpm, 80bpm, 84bpm, 88bpm, 92bpm, 96bpm, 100bpm, 104bpm, 108bpm, 112bpm, 116bpm, 120bpm, 124bpm, 128bpm, 132bpm, 136bpm