Hammer Slam
The hammer slam swings a single dumbbell from overhead down through a chopping arc, absorbed with braced abs and bent knees — a slam pattern where you never let go of the weight. It trains the trunk to produce force and then brake it, a pairing few gym exercises cover. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.
Muscles worked
Sets & reps by goal
| Goal | Sets × Reps | Rest |
|---|---|---|
| Strength | 4 sets × 3-6 max-intent reps | 90 sec - 2 min |
| Muscle | 3 sets × 8-12 reps | 60-90 sec |
| Endurance | 2-3 sets × 15-20 reps | 45 sec |
Rep ranges per Helms 2014 · Schoenfeld 2016.
Level — Intermediate
Intermediate — the braking half is the skill; prove it light before adding any load.
Proper form — 5 cues
- Stack both hands on the dumbbell handle as if gripping a hammer.
- Reach the weight overhead with long arms and the ribs pulled down.
- Drive it down the midline toward the knees, hinging slightly as it descends.
- Brake before the bottom — you own the dumbbell the entire arc; it never free-falls.
- Stand fully tall and reset the overhead position before the next rep.
Breathing: Sharp exhale as the weight chops down, inhale as you reset overhead.
The 3 mistakes Maddy corrects most
Common questions
How is this different from a medicine-ball slam?
A ball slam ends with release — the floor absorbs the force. Here you keep hold of the dumbbell, so your own muscles must decelerate the arc, which turns the second half of every rep into braking work for the abs, lats and grip. Same expressive chop, very different finish, and quieter on the neighbours.
What is the hammer slam actually training?
Power production through the trunk on the way down, and controlled deceleration at the bottom — the produce-and-brake cycle that sports and daily life demand constantly. The abs, hips, lats and forearms share the work. Treat it as an athletic trunk drill placed early in a session, not as a burnout finisher.
What weight should I use?
Far lighter than intuition suggests: most trainees do well starting between 4 and 8 kg. The test is the brake — if the dumbbell drifts past your intended stopping point or drags your spine into a round, it is too heavy. Speed and crispness, not load, are the progression currency here.
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