This is the speed where double-bass starts to sound like double-bass. Eight kicks per bar — two per beat, alternating R L R L R L R L — produces the rapid-fire kick texture that defines thrash, classic metal, and the entry to extreme styles. Above this tempo, every metal subgenre lives.
The mechanics are identical to the quarter-note lesson; only the rate has doubled. If your L foot is volume-balanced with your R at quarters, 8ths will be hard but achievable. If the L was a hair weaker at quarters, 8ths will expose it ruthlessly. Tempo discipline matters: this lesson works at ♩=100–120, no faster, until the 8ths are even.
The Hand Pattern Stays Slow
While the feet are doing 8ths, the hand pattern in these exercises stays at quarter notes (or 8ths in Ex 4). Don't be tempted to play 16ths on the hat just because the feet are going fast — it doubles the coordination load and isn't how the actual style is played. Hands hold the time-marker; feet do the heavy lifting.
Exercises
Eight kicks, alternating R L R L R L R L. Hands off the kit — focus entirely on the feet. Every R should match every other R in volume; every L should match every other L. More importantly, every L should match the R that came before it. If the bar sounds like BOOM-boom-BOOM-boom instead of boom-boom-boom-boom, your L is dragging.
Quarter-note hi-hat over 8th-note kicks. The hat coincides with the R kick on each beat (1, 2, 3, 4); the L kicks fall in the gap between hats. This is the cleanest possible coordination: hand and R-foot together, L-foot alone in between. Lock the hand to the click and let the feet do their thing.
Add the snare on 2 and 4 — quarter hat continues, snare punches through on the backbeats. The R kicks now coincide with the snare on beats 2 and 4. The kicks under the snare often vanish acoustically because the snare is louder; that's fine, you'll feel them. What matters is that the foot pattern doesn't stutter when the snare lands.
Hand 8ths and foot 8ths stacked on top of each other. Every hat coincides with a kick — the hand and one of the feet always fire together. This is the densest possible 8th-note metal groove and the foundation under most thrash verses. If it's collapsing, drop tempo and try again; below ♩=100 the coordination is much easier.