Where the power groove lets the bar breathe, the headbanger groove fills it. Kick on every quarter note, snare on 2 and 4, and the hand on every 8th — usually china for the trashy bite, sometimes hat. The result is constant forward motion. Every 8th has a sound; every quarter has a kick; the bar never stops driving. This is the engine under thousands of mid-tempo metal verses.
The pattern is mechanical but the feel is everything. The hand 8ths must be even — no rushing — and the kick must land exactly with each china stroke on the downbeats. The "headbang" is what the audience does when those line up perfectly: their head goes down on every quarter, locked to your right foot.
Exercises
Kick on every quarter — your right foot is now a metronome. Snare on 2 and 4. China on every 8th. The kick + china have to coincide on every downbeat (1, 2, 3, 4); the off-beat 8ths are china alone. Lock the foot to the click first; the 8ths are easier to even out once the foot is rock-steady.
Double-time hand: 16th notes on the hi-hat, played with alternating sticks (RLRL). The kick is still on every quarter, snare still on 2 and 4 — but now the hand is twice as busy. This is the thrash-verse feel: foot drives the headbang while the hand seethes underneath. Tempo dropped to ♩=100 because the 16ths require the wrists to relax.
Same engine as Ex 1, but the last 8th of the bar is an open china (or open hat if you switch). That open accent at the end of the bar is the breath that signals the bar is about to repeat — the band can hear it coming. It's the metal equivalent of the open-hat anthem from rock, but louder and faster.
Two bars treated as a single phrase. Bar 1 is the basic headbanger. Bar 2 ends with an extra kick on the & of 4 — a push into the start of the next phrase. This kind of two-bar shape is how metal builds tension across longer sections; the listener feels the bar 2 push and expects something to land on the next downbeat.